⚠️rape⚠️ Advice?

So back in 2016 when I was about 7 years old my cousin raped me. Not once but twice. I didnt understand what he did and I didnt think it was bad so I didnt tell anyone. And now Im 12 about to turn 13 and I realize what he did and How wrong it is. I was wearing a swimsuit both times if I wasnt wearing the swimsuit would it have happened? Probably not. I dont know if I should tell my mom or not. I really want to but I dont want to deal with the drama since he is in my family. She always gets mad when I flinch or I dont let people touch or hug me. But every since that day I have been like this. It was so tramatic. What if she tells my dad and then he doesnt let me go see my grandpa. (My grandpa lives right next door to my cousin? I dont know should I tell her or is it to late.