I don't really know where to post this but I just need some help.

My mom has full custody of me and my brother. My brother is 19 and is in the process of moving out. He's my moms favorite and she makes sure I know it almost every day. She is extremely emotionally and occasionally verbally abusive towards me and I don't know what to do about it anymore. In the past year I tried to kill myself 3 times because I just couldn't take it which lead to me trying to emancipate myself. None of that worked clearly, but with my brother home there was always some sort of bigger between us but now that its just gonna be us in afraid. I don't know what she's gonna do or how things are gonna change.