obvious pedos in high school

a boy in my high school touches students inappropriately. the worst part about this is he does it mostly to freshman and he’s a SENIOR. he’s done it to me and he’s done it to my friends and we’re all freshmen. the worst part is that none of the teachers believe any of the students and there’s nothing we can do about it. i avoid him at all costs but he still finds ways to harass my friends or me.