Molestation at 10....?

well i think this is molestation but im not sure. Well, when i was like 9 or 10 i went to this football game with my aunt. when my aunt went to get food, this boy who looked like he was 11 or 12 came and started touching my.... i didn't know what he was doin and a told him to stop but he wouldn't! i never told anyone about this. I don't even know that boy. Never seen him in my life. all i know is that he was fat and was wearing a blue baseball cap. Now im 13 and when i look back on it, i feel ashamed like it was my fault. IDK why but....i just do. I feel like crying right now. and i keep everything bottled up. I just cant take it anymore! i wanna tell someone but not my parents. maybe a church member or something. I feel so bad. Ive been abused by my mom for 5 yrs.! since i was 7! i just wna tell someone....