Help with family?

Today I had an argument with my dad. In the past while I grew up and I misbehaved he would beat me up (it was bad, he would hit me more even if I looked at him the wrong way) however he hasn't hit me since I started defending myself (at first I would scream at the top of my lungs, later as I grew up I would hit back and swore that if he hit me again I would call the police). While we were arguing today he accused me of being the cause of the family growing apart. I am very open with my parents and tell them about 95% of what goes on in my life, yet every time we get into an argument he uses the things I tell him (example: I told him "I corrected a clmate's paper as strict as possible bec. I don't like her", he then during the argument brought this up accusing me of not being a good christian). If anything I think that due to his abuse I am not normal sometimes. I am a good son and get really good grades, do debate, run, etc. But how am I supposed to forgive my dad and move on?