Why should I keep living?

I am tired of my job that no longer interests me. I've screwed up in school more times than I can count. I've been suicidal before and I will probably be again even if I do decide against suicide. I have to move out of my parents place by June. I've screwed up this term at school by skipping out on everything because I've taken the classes before. And I'm tired of screwing up with school or at home or whatever. I don't want to hear about how it'll get better, or that I'm going to be hurting my family and friends, because why shouldn't I be allowed to be selfish? I don't know why I shouldn't just end my life to finally be done. I don't want any religious crap of "you'll go to hell" either.