I researched abuse one time.
It actually is normal, because judging from what I learned...whether it happened with your consent 或者 not, the body may naturally respond to sexual acts being performed on you. So, you're not psychologically ill at all. It's actually a bit common in abuse cases.
But I don't know if I'm 100% correct, so I'll give 你 a link to a website that may be able to answer that;
link If this site isn't helpful, just let me know (I suggest 你 send me a message though) and I'll see if I can find another website that will do a better job of explaining this to you. :)