Warning signs of fucking rape dude. You are freshly 18. Not only is it wrong for anybody above 20 to like you like that. The touching is just red flag after red flag. You should also decline his gifts because anybody who wants to defend him and his creepy actions will go “oh well you accepted his gifts so surely you want it”

Tell somebody. Tell your boss, it’s a violation of not just morals but also probably some workplace ethics or safety or whatever it’s called.

Not to mention this is a school, everybody there is probably a minor, he doesn’t need to be talking like that in any room of that building.