OK help on big problem please!!?

Ok so at my locker there are these people(bad people lol) that stand infront of it. and twice now they have run into me and i slam my head into the locker. yeah it hurt. so i tried movin to a diff locker. i found one and stuck a pencil in it to make it open everytime cuz idk the comibnation. but i heard my principal will take out the pencils and i dont want the locker not gunna open. what should i do? i dont want to tell any teachers cuz theyll talk to thekids then the kids will hate me. i need like more confidence so when i say excuse me and they laugh i wont get mad..(i get sad very easily)