I Dont Know What To Do Any More!?

Im 14 and i live with my mother and my step dad and my brother and his girlfriend. I am the only one one who does anything around my house Clean,wash dishes, landury etc. And my mother is a pain i am a teenager and i try to go out and do things with my friends but im never aloud because i have to be home to do everything she says. and when i dont do it or do it fast enough she hits me and my whole life has been like this my dad was a drunk who beat her but still i dont think its right for her to it me. ever since my step dad has came into the picture he has been telling her how to control me and i dont like it he trys to act like my father but ii do hate him. I try to talk about it to my family but they dont care because my aunt an my gma did it to their kids too. And i try to talk to my cousins and they dont listen. So there is no one for me to talk to i hate my life and most of the time when my mom hits me i wanna kill my self. My mother she has problems and alot of anger and she takes out on me i have to lie to my teachers at school why my face is brused and i have scratches on me there is problay on 4 that no what my life is like and im tired of having to hide that my mother beats me! and i dont know what to do anymore!