Abusive or just playing?

Okay so this is really silly but I'm going to do it anyway. I lost my virginty to my current boyfriend a little over a year ago. I said "no" when we tried the first time but that didn't stop him. I still say "no" sometimes but that still doesn't stop him. He just pushes my head down. Today we actually got into a altercation. He pushed me into the side of the car and I hit my head really hard. He also punched me a lot but not in the face. I don't know what to do here. He said he didn't mean it. He hits me a squeezes my face and arms a lot but I don't think anything of it. He also choked me today. I think he thinks it turns me on? Either way I don't know what to do here. I need your help.