Why does my mom treat me like im a freaking 5 year old?

ok so get this ever sense i 14 she treated me like im a freaking kid. my bed time is at 9:30 im not allowed to have a cellphone till im 15 i cant have a girlfriend becuz im to young and it pisses me off

i go to a private school (and im doing advance classes even though im dumb) and there i am doing all my work trying to get a good grade and then when i come home the first thing i do is check my facebook (for like 5 min) and then i do my homework my mom freaking yells at me when im reading my textbook she thinks im playing. and when im doing math and working a problem in my head she screams come on get your homework done i swear its going to take all night for you to finish and i lose track of where i was so i get mad and tell her to be quite and she just blows up infront of my face. so she has no job and so she is so stressed out she takes it out on me and not my 17 year old sister. and she claims that all my friends are bad influences on me for example my friend bradley he makes bad grades she doesnt want me to hang out with him that much and my friend jim ya sure he is a trouble maker i dont care my mom doesnt like for me to hang around him and my friend zach he is a little mean to me but idc ya sure he may have beat me up in his moms office (shes the princeipal of the school) i dont care i think hes cool. but im good at computers and i do all kinds of stuff to my old hp-g60 laptop like install ubuntu she thought i broke it so i put windows 8 on there (the default os was vista) and there is no sound so i put ubuntu on there again and she gets mad but the speakers work and i prove i know what im doing. i hate teacher ease when i make 1 bad grade on my assingment it goes in the email and she thinks the teachers are sending it (even though its the robot sending it) and she yells at me and im grounded for the month and i point out how come it doesnt send you any good grades what about my favorite teacher coach gamel do you ever get any emails from him (making a 95 A in his class) or mr. Ivory ( 92 i think) and then she justs shuts up because she knows its true. and also when she gets a email she thinks its just so easy for her to send her a email that i will do better and i cant do any better. also i got a xbox 360 right and so i ask if i can get call of duty but ever sence that elementry school shooting and people say how those games can mess you up she wont let me get it ( i even bet that they didnt have cod or halo back in his day) and the type of music i listen to dubstep and deaadmau5 and i show her a pic of skrillex ohhh he looks emo i cant let you listen to his music but i showed her bangarang she gets mad and says turn that s*it off

also she doesnt want me to take my ipod to school (becuz this one jerkbag ripped off my case) neither does my stepdad and im not allowed to take my 7 inch tablet that i payed for and when i go to bed she wont let me listen to any music (music helps me calm down and get tried) she thinks ill play with my ipod if she let me have it at night and like today when i got my hair cut (i normally have long hair like an asain does NOT TRYING TO BE RACEIST) and she told the barber to give me a 7 year old cut even though i told paige (my hot barber) to get a inch like normal times i was mad also it makes me mad how she has a desktop computer and she doesnt use it no more (me, sis, stepdad, mom) we have laptops and she complains on how she wants to get rid of it but she has info saved on there and when i tell her i can format it so she can sell it (its a very beatiful machine people will pay in grand to buy it) and she dont trust me on a fat32 format im so dang pissed if someone is out there please help me

also at my dads house its nicer there my dad lets me do watever i want no bedtime no game rating for me (he got me cod black ops 2 :D) he even lets me screw around with his computer and my mom text him are you sure you want to do that and i just got so D*MN PISSED grrr she makes me mad