Social phobia agoraphobia?

I'm 17 and at college and my life seems like hell. I feel like crap everywhere I go and sometimes dont leave the house for 2 weeks at atime. I hate to go on but my mum swears at me everyday and makes me feel pathetic and worthless. She says I have nothing wrong. But then she acts nice and talks then I feel guilty and like I overeacted. I want to cut her out of my life, I tell her but she would laugh or not take it seriously. Am I the brat? Please tell me the truth of your thoughts, btw I can't stand people who pity themselves with issues like this because people get killed out there all day and I feel I pity myself sometimes plus it's a sin. Anyway thanks 4 readin.