I can articulate this very easily.
Relationships do HELP to solve all your problems, and the reason for is, that you are a biological machine that is governed by the biochemistry that takes place in your body, your moods, your health, your physical appearance, your energy levels are all the result of biochemical processes, and on a biological level what greater validation is there to your being than being attractive both physically and mentally to someone of the opposite sex? Someone willing to spend time with you, someone willing to have sex with you.. Once in a relationship you receive that very important validation of having the potential means to pass your genes with... and because of that your body, will produce more of the chemistry that makes you happy,that makes you energized and all of this will translate into you being more driven, more energized, more positive in life, which will reflect into everything else that you do, whether that be professional ventures, personal growth...
I can link to numerous studies that show that people that have spouses live longer, and are happier, and more successful than people that do not(in the general sense). And people that don't have spouses typically are more prone to depressions, and illness, and suffer from lack of energy and drive which hurts them in life.
So yes, while you will not grow a pair of wings, and 10 million dollars will not appear in your bank account after you get into a relationship... You will be more equipped to achieve success.