I am so sorry you have to live like that. I am a long time sufferer of Misophonia, though I never knew it was actually a "condition" until stumbling upon this page.
I am 42 years old and have often felt the uncontrollable urge to punch someone in the face when they were popping their gum. I can be in a great mood, hanging out with a friend or family member and as soon as they open a pack of gum or put anything in their mouth, my mood goes to instant rage. i cannot stand it!
I hate the sound of my coworker in the next cubicle clicking his mouse (hard). I understand when you say your friends say " oh that bothers me too" no no no, it doesnt just bother me, It makes me want to rip your face off and feed it to a dog. Theres a big difference.
When I go to the movies, I wait until the movie is almost out of the theatre and then I sit all the way in the back row, so noone can sit behind me eating popcorm. Then on top of all of that, I caarry ear plugs with me at all times. I have said on many occasions, I think I would rather be deaf than to have to deal with this.