self-hatred, afraid of everyone

I hate myself and I feel like a complete loser.  I used to think I was somewhat pretty, but now I feel ugly, especially on the inside.  I feel disgusting and dirty like I murdered someone.  I am taking summer classes because I decided I just had to double major in another useless liberal arts field and it’s hard not to compare myself to people out having adventures and experiencing life. I don’t think it’s that lame to stay in school necessarily but for some reason I feel like I’m horrible for staying at home with my parents with no money or job, crying like a baby every day over how unhappy I am and thinking of myself all the time.  I don’t try anything new, and I don’t know what I want to do any of the time, and I burn bridges with everyone and am terrified to see them in public.  I can’t even rationalize why I feel disgusting and unworthy and hate myself but I’m unhappy because everything feels pointless and I don’t feel I can connect with anyone.  Even interactions with my so-called couple of friends feel shallow and like I have to hide myself.  I’m afraid of everything and everyone.  I need some hope, I’m only 22 but I feel like an old person, like I’m almost in the grave already. I just want to feel better but I’ve been trying for a while and I don’t know what to do anymore.