I was suicidal for years and during that time I came to know a lot of other people who are suicidal and so forth. Well this in not an official list and this list is not necessarily in any specific order. This is just a list I have come across in my life of the top main reasons why people usually want to end their life by committing suicide.
1) Some kind of chronic illness, disease or disability that is painful and hard to deal with and or incurable
2) Major financial problems. Like overwhelming debt or having lost all they ever worked for > or just ongoing poverty
3)Suffering mentally and or emotionally through some type of abuse that they have been through and finally cant take it anymore.. this could be from a spouse or a parent or some other means.
4) Loss of a close loved one. > like maybe their life partner died or their child suddenly died and they cant take the loss and feel they have no reason to go on
5) Suffering some type of social pain. Like maybe they did some weird thing that got caught on tape and now the tape is circulating and they cant stand the social pain of it.
6) Suffering some type of bad addiction and cant take it anymore. This could be drugs or alcohol or some other thing
7) Mental illness. Some people have been battling mental illness issues for a long time and cant cope with it anymore.. like maybe they hear voices or cant concentrate or have some other mental disease such as autism, schizophrenia, Asperger's, bi-polar or other types of mental illnesses.

Loneliness. Yup some people have been without a spouse for a long time and or maybe don't even have any friends so the loneliness gets so bad they just end it. There are even people who were rich and famous in life who have ended their own life because they said they were so lonely.
9) People facing prison time or some other unbearable consequences for their actions. Yup > I have seen this happen. A person winds up getting caught for something that they will wind up in prison for the rest of their life so before the trial comes or before they get sentenced > they end it.
10) Bullying or emotional abuse. Yup > some people have been bullied or mentally abused by somebody over and over and finally the pain of it all causes them to end it
11) Feeling like a failure in life. I have seen this. some people feel like they should have achieved certain things by a certain age and if they can achieve those things some people feel like such a failure they end it.
12) Religious persecution. I have seen this many times. A person might have been brought up in some religion that tells them that certain things in life are SINS against God and that they will go to hell if they ever do those things. And if they have gone out and done some of those things > the fear of Hell or fear of God or fear that other religious people will hate them causes them to end it.
13) Embarrassment. Some people have been caught doing something very embarrassing and if and when it comes out publicly they cant stand the heat and want to kill themselves > this is similar to number 5
14) Feeling like there is no real purpose in life. Some people get like this > they just have this view of the world that there is no purpose to their existence so they want to end it
15) Failed Dreams. Some people had big dreams to want to accomplish certain things in life and if they come to a conclusion that their big dreams are probably not going to happen they want to end it
16) Guilt. Some people have done some bad thing in life. Like maybe they hurt somebody really bad or maybe even killed somebody when they were drunk or on drugs or committed some heinous crime or something along those lines and now the guilt of what they have done causes them to feel like they do not deserve to live anymore so they want to end it
17) People who cant stand all the evil in the world and just want to leave this life. I have seen this many times. some people read the news all the time and focus on all the bad things that go on in the world and then they lose faith in humanity and just want to die and go away from this world so they end it
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Fascination with death. Yup > some people just at some point in their life > just become fascinated with death and want to experience it so they end it
19) Bizarre Belief systems. There are some people who develop some kind of weird belief system where they feel like suicide is something they are supposed to do. sometimes these beliefs come through religious cults or something along those lines.
20) Sick of life. Some people just get to a point where they are just tired of going through the motions of life and just don't want to do it anymore so they end it.
21) Government oppression. Yes in some countries The governments are really bad > like the government takes away the peoples rights and or oppresses them with harsh laws and rules and some people cant take it anymore and just want to end it
22) Post Traumatic stress disorder. Some people have been in a war or some other bad violent or hurtful experience and even though they survived it > the mental anguish of the memories causes them to suffer for a long time and often they cant take it anymore and just end it.
23) Loss of HOPE. Some people just lose Hope in life. They just lose Hope that life will ever be good for them so they end it.
24)Fear of some kind of impending pain. Like maybe a person has an enemy that has threatened to hunt them down and hurt them > or maybe an organized crime ring is out to get them so instead of waiting for that to happen they end their life themselves
25) Loss of freedom. Some people wind up becoming a slave to some other person or group and after sometime of having to live like a slave > they end their life because they have no freedom. Examples would include people who are kidnapped or people who were sold into sex slavery and stuff along those lines
26) Racism. Some people are born into some type of race or class of people and in the area where they live it might be really hard to be that type of race or class of people and some people just wind up ending it because of that.
27) Feeling like their life is just over. Some people when they get to a certain age > they feel like their life is just over and feel like its just time to die so they end it
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Fear of torture. Yes in some places on earth > sometimes a regime rises up that will capture people and torture them. and sometimes a person who feels like they might get captured and tortured might end their life themselves to avoid such a thing.
29) Homelessness. Often if a person winds up homeless in life they might not be able to cope with that so they end it.
30) Loss of JOY in life. Yes, some people come to a place in life where they just cant seem to find any joy in life so they decide to end it. Like they get to a place where all the things they used to do that used to bring them joy in life they cant enjoy anymore.. so they just end it.
31) Unable to live up to their obligations. Yes, some people come to a place where they have all these obligations pending on them and if they feel like they cant live up to and meet those obligations they just end it. This can be situations like where a person has gone out and fathered some kids.. but comes to a place where they cannot provide for the kids and or cannot live up to the role of being a proper parent then they might end it. Other obligations can bring this on too such as family obligations, work obligations, financial obligations and so forth.
32) Identity crises. Some people come to a place where they go through a big identity crises... where they suddenly feel like they do not like who they are or who they have been... and are not happy being who they are and just want to end it. Sometimes a person may be unhappy with their gender like maybe they were born a man but truly desire to be a woman etc or maybe they are unhappy that they have come to discover that they have never been true to themselves in life and maybe don't even know who or what they want to be in life so they might end it their life over a massive identity crisis.
33) Ongoing Oppression by some powerful people or group. This can sometimes happen in life. A person may be rich, successful and maybe even famous.. but then some powerful people or group of people comes and blackmails them for money, or might threaten to destroy them in some way or threaten their loved ones if they don't do certain things or adhere to what they tell them to do or if they talk about something they don't want them to talk about.. and the pressure of this oppression might cause them to end it.
There are more reasons > but off the top of my head I just made up that list
If you have any you want to add to the list feel free to post about it