Yeh my dad was physically abusive and horrible when I was young aswell.
Maybe he's changed or maybe he hasn't.
Let him believe what he wants to and you believe what u want to believe. Forgive him but be wise in who you choose as Company.
Focus on your own life. If you're still living in his house and he's still abusive, report him. Don't beat him up don't Lower yourself
God bless you