I had this vibe, y'know? But when you're a 13 year old kid WTF do you know? Then one day in gym class (I clearly remember, it was "square dance" day), she pinched my ass! I shit you not! Then I really started making a concerted effort to avoid gym/showers/her. I started running out of excuses and started enlisting my mother, I'd have her write me notes to get out of gym class altogether.
There were more than a few pervs in that school district. Thankfully, we moved when I was in 9th grade but it was an experience, to say the least.