Depression? I need someones opinion.?

[Megandeth]

im 20yrs old and I am super shy. I have maybe 2 friends that I actually call close friends. Here in the past couple of months i've been keeping to myself. Sitting in my room all day. Reading, watching tv, playing video games, anything to keep me occupied. I always try to look my best but when I do I don't think that I look very good. And i'm not one to worry about what people think of me its just I cant stand to be judged. but thats going to happen regardless. Anyways. I don't leave the house but maybe once a week and everyone told me to get a job it would help. but it didnt i recently had to quit because it was putting further into whatever it is i'm in. I feel like i'm in a dark place these days and I cant seem to get out of it. I hate myself and everyone around me. I'm attending college and I still have no idea what I want to be. I feel as if I am nothing. completley worthless. I feel this way all the time. I don;t trust anyone enought to talk with them. I cant afford a shrink.help?
I also feel as if noone really knows me or understands me...and i also feel that I will die alone because noone could ever like me....seriously...give me your opinions or maybe some words of encouragement.