Is this abuse? If so what do I do?

My parents repeatedly scream at me and make me feel worthless.I'm a 16 year old girl by the way My mother has temper tantrums and acts like a 5 year old when she gets mad stomping her feet, yelling, and screMing almost to the point where she is in tears. My dad sides with her and backs her up. But they get mad at me alot more them my sister. They compare me to her even though she's younger and make me feel stupid I try talking to them about that and they tell me try harder. But over the past few years it's gotten worse my mom has pinned me down on my bed and yells at me and I'm not strong enough to throw her off. My dad on the other hand yells and points fingers but only in the past few years has he been hitting me. Recently being he hit in the arm after scolding me and I fought back cause I didn't deserve it and then he persisted to use me as a human punching bag to the point where I lost feeling in my left arm for the rest of the night. I only hit him back once. I'm scared but I dont want to go to the cops just yet I want to try and be civil about this. I don't know how to handle this their very good to me and I need guidance as to what to do.