What should I do with my life when I just turned 21?

I just turned 21 last week and I'm currently living with my mom and stepfather. I'm working for a family business under minimal wage and I'm taking a college cl. Growing up with my biological parents was tough. They were emotionally and physically abusive. My father has always been a dead beat of sorts having nothing to do with anyone really. I was sent to "special" boarding school at age 12 that dwelt with learning disabled kids. This was a label I had to suffer with all my life, while I witnessed my mother cater to my two sisters. My twin sister is like a princess... my mother buys her expensive dresses (even secretly tries them on), put her in dance cles at an early age, forced her to go to a sorority. Anyway, after coming home from boarding school and having to deal with stepparents I was socially stupid and desperate for attention. I tried running away, but this led me into a hospital and later to a 24 month theutic program, which completely sheltered me more. At 18, I went home for my senior year and it was tough making friends, staying motivated in school, while living between two parents and dealing with my dead beat father and his controlling selfish wife and my mother who marries for security and married an alcoholic prick who cares more about golf and drinking with his buddies. I went to art school when I left, but I couldn't handle it because mentally and emotionally I wasn't capable. I haven't been in school until now. I live away from home for a while and tried desperately to fit in with the crowd. I was promiscuous and selfish... my dad paid for my apartment , but said I had to find a job so I could eventually pay for it. My father never really taught me how to be a man because he was just a boy himself. We aren't on good terms and he and his wife choose to distant themselves from the whole family. Now I'm living with my crazy anorexic mother and I can't bare it anymore. I was living with my grandparents, but I couldn't take it anymore even though I appreciated there help. I hate feeling like a loser with nothing go on for me. I'm seeing a therapist right now and she claims I'm suffering from PTS disorder. I don't know if school is the right choice... I'm just wasting my moms money, I'm not really motivated to excel because I've never been a high achiever. My mom used to ask me if I wanted to skip school growing up. She even did my homework for me when I was fully capable of doing it and my mom isn't a very bright person (not to be mean, but I'm a lot smarter than her)... she congratulated me when I made a C, but got abusive when my sister made a B. My sister wanted to go to community college after high school and my mom has a hissy fit because she wanted more out of her... but it was okay for me to go to community college.. "Oh honey, it's a great school" ... my mother is in denial about everything and I think she has contributed to my lack of confidence growing up. I didn't do much growing up because I was never expected to. Now I am suffering the consequences at 21. I really just want to escape from my family. My parents have been nothing but disappointments my whole life. I was going to join the Navy, but I failed the military test and plus I'm gay...and I don't want to live a lie "don't ask don't tell". It's just not fair. I feel like the biggest loser... I feel guilty having my mother support me financially... I just want to move out at this point, but I don't know where to go. I don't have many friends. I just want to get out of my super conservative money oriented town. I want to be around positive people who don't judge. I can't live like this forever... it's going to be too late soon.