"Can't anyone tell me how to just improve my relationship? How to stop my mental problems from screwing everything up all the time?"

Rio, I doubt any of us here can tell you how to improve your relationship. We aren't professionals and can only direct you towards finding a licensed counselor. They are trained to help you understand why you think your mental problems screw everything up.

"I'm not going to live my life worrying about whether or not something is right if it's something that makes me happy. "

That defiant phrase from someone your age is very familiar to me. Heard it plenty of times in my life (as I am old enough to be your mother). Someone I know well used it many times. That person is about 10 years older than you and is now in a place he/she never imagined she/he would be at your age. And it isn't a nice place.