I was caught .... HELP!?

Hi, I would'nt worry to much, they probably got more of a fright than you. Unless they know you personally then the rumour might go around for a few days, but they wont know it was you. Either that or the guys wont say anything in fear of getting in trouble, as they should'nt have been walking in to the girls changing room anyway. I would also warn your gym teacher that these boys are going into the girls changing room. I know this is embarring for you, but this will p in a couple of days.