My mom is abusive

Probably deleting later but my mom absolutely hates me. I am a teenager going into high school and my best and only good friend who was going with me just moved away. I feel as if there is nobody to talk to. My dad died about half a year ago and its like my life has become more and more antisocial to the point where i just sit in my room all day contemplating why the hell I should keep living my life if it just isn't worth it to me.

This morning I woke up to my mom hitting my sister to the point where she was screaming and having a panic attack. They have now both left to go to the dentist and i am going for a drive on my own to try and rid myself of this unbearable feeling. Sorry for the rant