Abusive Father...idk what to do.

Please help me!!! My father and I don't have a good past at all. It would take too long to tell everything, and I don't have time fore it. I came down to live with my father to work on our relationship, which is the worst decision I have ever made. Since, I've been here he has yelled and screamed at me for stupid things, and has even turned he side of the family against me. He hit his girlfriend in front of me, and even pushed me. I am afraid for my safety, and believe strongly that he would lay his hands on me. Should I call the cops?! I would piss a lot of people off if I do, but this about my safety. Please help me!!!