I am getting suffocated by my parents?

Just thinking how to start my problem. This may be a bit foolish. But I am really getting annoyed now a days. I am 20 years old now and a male. But I don't know why my parents are overprotecting me. They don't allow me to go to any college parties, any picnic or excursion with my friends. Even I cant enjoy my birthday with my friends. They insist me to go to some temple and pray. I obey that but after all as a teen I need some privacy but they dont allow it. If ever I am chatting with a girl in yahoo my mom continues to peep through the door screens to which girl i am chatting and then ask me about who's she...what..how... a lo of stupid idiotic questions. I just cant understand them. They don't allow me to go anywhere alone and every time they try to tie me just to bed and books. before some days i had a minor car crash and it was nt my fault. a drunken truck driver smashed to my car,and luckily i got escaped with some minor injuries. Now after a year also they don't allow me to drive even go somewhere in car with friends. They think i will be drunkard.What the F**k is this i cant understand. I was having a gf (really cute one). Even her parents allow her to have such a good close relation with me( not talking about physical relations). but my mom (oh my god, i cant tell the matter in detail, as I think u cn understand it). after all she dumped me. I am now really irritated by them but still now I am a student and living in their house. And also i cant afford to live alone. Plz friends, give me some suggestion. really need your help