Im scared

I want to tell people what happened to me. I’m 15 and I went through 6/7 years of sexual abuse by my stepbrother. I want to tell me family but Im scared he won’t go to prison and my family will hate me and his family will hate me and hurt me or something. I really want to say something. I am so scared because I don’t want to lose my family. But it’s really ruined me mentally and i self harmed for years. And I couldn’t bare the thought of him doing it to anyone else. But i have no evidence so it’s likely that he will get away with it so is there any point ?

Im really worried and it’s all I can think about. Do I say anything? I hate talking to my family about my feelings too and this would make me uncomfortable but if he goes to prison it might be worth it? What do I do. I’m so scared and I feel sick all the time...