I just don't know what to think

I overheard my mom talking with my aunt about one of the old foster kids who used to live with us, and she told my aunt about me being molested by her. I didn't even know I had ever been molested. I just don't know what to think. It's really bothering me because I've always had been very sexual even as a child and now I'm wondering if it's because of that. I feel so incredibly violated and I just don't know what to do or what to think. I don't want to tell anyone because I don't want people to look at me differently.