PLease!! Who can help me?

Omg, my mother is like.. id ont even know the word for it. She expects me to be perfect at EVERYTHING. Im turning 13 in may and she doesnt let me do anything. I usually spend my saturday's at home. Actually i spend all my days at home because she doesnt let me out or anything. Only like once a month maybe? All my other friends are allowed out everyday but what about me? im not a old lady, lol im about to be a teen . All she EVER whaants me to do is STUDY STUDY STUDY.Its depressing sittin at home while my friends are out having fun. I wana have fun while im young like comon now ohh&&She walso wants me to get straight "A"'s if i get a "B" im grounded? Whats the point of being grounded when she already doesnt let me out.URGGG!! i need sereous help with this. i dont wanna spend my time at homr my whole life.. if you cant help me with this i will love you forever!!!!! :P.