For an immediate fix, get away from them by going to other people's houses as often as you can. Go to the library, the park, the mall or anywhere to get out. Get friends who treat you right and are there for you and stay at their house as much as you can. Find a job as soon as you can, even if it is babysitting, Become self sufficient, so you can move out on your own as soon as you are able.
But for the long run, maybe you could talk to a school counselor or someone you like or another family member you trust. You need to do something, because you deserve to have peace and happiness, don't let anyone take it away from you! : D