How do I tell guys to fuck off and leave me alone

Me a normal 14(f) I need advice from yall on how to make teen boys (even some that are my friends in class) stop doing this- at school they always call me out about my body(not that I’m fat, more sorta good way, but STILL ITS NOT GOOD to talk abt a girls shape) and when walking up the stairs they all stair at me and say “why u staring at ####s ass out loud on purpose so I can hear” I guess it’s a commentary way, but they are making me uncomfortable to wear my skort(we have a uniform and so what if I wear my skort short I like looking average) and I guess they call me hot but it makes me feel shit, not good, as well as makes others think I’m a pick me when I ask them to stop and leave me. How do I ask them to leave the stuff about my body and appearance alone 😔 I need help 😭