How to deal with my sister... and step mom.?

Dude my step brother was treated like he was a king and I was treated like sh** and it made me mad when I was young. I used to alienate myself. I would engulf myself in books and listen to music talk to my friends. I used to feel so uncomfortable I would alienate myself and make myself invincible. Even as an adult I had some kids I had to take care of and I ddnt want to and I would alienate myself. I apologize that you are going through your situation I would advise as a parent to still be obedient though even if you don't want to. I feel your pain I REALLY DO.