I'd say your first problem isn't that you aren't doing as well at chess as you like, but rather that you seem to have a very unhealthy attitude towards the game and yourself.
1) Why do you do something, compulsively, that you dislike? How long has this unhealthy fixation been going on?
2) Why do you berate yourself for merely losing a game?
3) Why don't you believe that when you win it's a genuine win and deserved?
… or at least not for me.
I’m rated 394 in Rapid and much better (I think) in 30 min. I’m doing fine at life.
Oh, and I also have a genius IQ. The problem is… I feel horrible when playing chess. Every single time I win, I think: “I didn’t deserve to win that game, I only got lucky, I’m so stupid, etc.” And when I lose, my mental abuse is even worse. 5 BLUNDERS YOU SHOULD QUIT CHESS NOW but I can’t quit chess. I can’t walk away, and I study for hours and never see any improvements. At all. I miss simple tactics despite always getting them in puzzles. I feel like I never win ever.
Can someone help me? (PS No “play slower time, do more puzzles, read more books, don’t focus on openings, be paranoid, I can coach you, you should just quit, take a break” because I’ve seen these over and over again)