It's not unusual for a child to feel like you do. I'm 63 but there are still things that I know stem from my being repelled by what my parents did. So many of my friends were the opposites of their parents. My parents were very vulgar so my brother and I are a bit prudish. I was in a position to visit only when I wanted to so I could keep up the family unit ( which gets more precious as you get older) but not so much that they could bring me down. Be polite and treat them like acquaintances. Don't let yourself be vulnerable to their put-downs. The less they know the better you'll be.
Believe me. Things get better as you get older