Help i don't know what to do please help?

im 15 my mom is abusive to me mentally, physically, and verbally. she also her husband and i have bad history me and hm fight now because of that bad history when i was little he use to throw me around pin me up against walls and threaten me i was only 7 years old this continued till i was the age i am now now we just fight whenever my mom tells him to leave and he refuses to or whenever he thinks he can hit my mom and get away with it. my mom on the other she is aways talking about me behind my back and saying so horrible stuff and then she says it to my face after that. and she beats me with things like wires and anything else she can get her hands on or she will just start punching and kicking me. a week ago my girlfriend and her family found out about this stuff and called cps i admit i was scared so i lied i lied because i didn't want my little sisters taken away from me and put god knows where. but i cant take it anymore my mom is saying more and more bad stuff about me and she is keeping me away from my girlfriend and trying to get her put in jail and her family and i don't know what to do i know if i runaway that my girlfriend's family will take me in but i don't know i need help