I’m broken and i can’t fix myself....

I need help but I don’t know how to get it. I have the lowest self esteem every and honestly I just hate myself. My twin treats me like shit. I have no friends. I’ve been treated like shit in all my relationships I’ve had and been cheated on. I’m really trying to be happy but I can’t, I have no one and the relationship I’m in now I feel like I’m ruining it because of my past relationships. I don’t know what to do. I just want to give up...