When you get to college, look into their mental health services immediately. In fact, you can do that online right now! In the US, residential colleges almost always offer some kind of mental health services. They are often only short-term, but that can be enough for you to get some coping strategies and to put a better long-term plan into place. A counselor at school can help you figure out what you need and how to get it.

I recommend it highly. I knew something was wrong when I went to college but I was too scared to get help. Like you, I figured I should be "over" what had happened to me. I felt that way for many years before I finally got some outside help, and I am doing so much better now. When you are at school, you have the opportunity to reach out-- plan on doing it! Because you deserve to feel better. You don't need to suffer alone.