Humiliated by group of girls when i was 13

When I was in the 7th grade (13 years old) I was very active in sports. My mother didn't drive (health issues) and my dad worked late, so I would often have to wait for long periods of time after practice to be picked up (too far to walk). The cheerleaders, mostly 9th grade girls but a few 8th grade, practiced at the same time as the sports. They would often talk to me, tease me, and tell me how "cute" I was. One day in the spring, they (a group of 8 of the girls) grabbed me and pulled me into the girl's dressing/shower area. They then pulled me down to the floor and held me down. I was still wearing my track warm ups and they began to pull them down to my ankles, then pulled my underwear down. They laughed at my "little weiner" as the took turns touching it and rubbing on it with their hands. Of course, I could feel myself getting hard which just increased my embarrassment. Soon I was hard as a rock which seemed to make them more aggressive! Soon I shot a load of cum which they smeared on my face. They threatened to tell the entire school if I told on them. I faked being sick for a few days and when I got back to school, I think every kid in the school knew about my experience. Ended up transferring to another district. I pretty much hated girls from that point on, I now crave same gender sex, and often expose myself in very risky ways! Was that experience the "trigger" for my sexual preference and my risky behavior? I know I'm responsible for my own actions, just wonder if it's normal to respond to that experience as I have? No voting necessary, but would appreciate any comments. Also wondering if anyone else has a similar experience.