I'm stuck in a relationship I didn't really want
How did you get stuck into that relationship?
I was drunk and the he convinced me that he is a cool guy
It sounds like the relationship is toxic, you shouldn't stay in a relationship if you aren't happy. You should break up with him and find someone new.
I don't really care about the relationship. It was meaningless.
I'm glad you don't care about it, but he might so you should let him down easy.