I need some character study movies to watch

Something like, a movie about some guy (or a bunch of people) who is a "loner" or "loser" and shit like that.

Like Taxi Driver, Punch-Drunk Love, Adaptation, Happiness, I DUNNO, stuff like that. You know what I'm saying?

Hook me up with some movies like that, or some depressing movies and shit. Got nothing to do tonight.