Greetings Jadis: First and foremost, please do NOT hate yourself, there is absolutely no reason to. Most of these sick abusers go after children, for the very reason you stated, the child doesn't know better!
I am sorry this happened to you. The fact it happened will never go away, but that person will never be able to harm you again.
The best possible recommendation I could extend to you is counseling. Please contact a therapist who specializes in this field and please make an appointment with him or her, sooner the better.
In the interim, please do not hate yourself and please try not to cry. It is no doubt hurtful, but it is in the past and you will not be harmed again.
Please check in with us and let us know how things are going for you, we care! We will also try and check back with you as well.
All will be OK sweetie, count on it!
TWM