What Should I Do?

Hi, I'm 15 years old, my dad is a 53 year old guy(currently) , he was married twice (it's allowed in our religion) and his first wife wasn't my mom, they couldn't have kids so he married mine. In my childhood I was attached to him, when I turned 11 we started having our ups and downs, he slapped me more than once, but my mom and step mom would always stop him, he pushed me around always but surprisingly it didn't ruin our relationship. I thought that I deserve the punishment, but he didn't hit my other siblings like me, and he also hit my mom. My step mom was actually amazing but she was sick, when she died last year, it broke us all, and dad became more violent, first i thought it was normal for a husband to punish his wife, but then my friends were confused when they asked me about the noises and yelling of my dad in a sleepover. He always found a way to humiliate her, and always compared me to my cousin (who's also my age) in everything till this night i snapped and told him not to compare me with anyone again, so he hit me, and he hit hard. I'm very scared of facing him tomorrow, and idk what to do. Help me with some advices? (sorry if it was a bit long)