Sexual Assault PTSD? *TRIGGER WARNING*

I was molested when I was 7 bymy stepbrother. It has been over 12 years now and I still haven't gotten over it. My family knows about it and everything, but I have anxiety and some (what I think are) PTSD symptoms because of it. I don't like it when people touch me and get really tense when they do, I have a hard time conveying or controlling my emotions, I almost think people have alternative motives when they hug me, I have had flashbacks of the abuse before, and the anxiety just causes me to not trust anyone. I want to tell my doctor about it, but do not know how to bring it up. I want to be able to heal, but don't know where to start.