Why are guys soo mean?!?

im a late bloomer, and it all started in the summer of sixth grade where this kid (nicky) used to make fun of me because my boobs werent fully developed. i spend my summers in upstate new york in the bungalow coloney with a bunch of other kids. and nicky was always teasing me. It got to the point where it wasnt even joke and it started to get really hurtful and he wouldnt stop, it went on for about a month and a half into summer. he made jokes about it and everyone laughed with him. people started to call me boobless and chestless. nobody was calling me by my real name anymore. it was always hey boobles hey chestless and nobody stuck up for me not even my bestfriend. Eventaully it got soo bad i didnt even go outside anymore. i would tell him to stop and tell him it wasnt funny but he wouldnt. Eventaully i got sick and tired of it and i hitt him and i got into a fight with him. like an actual fight with hitting and everything. he was fighting backk but in the end he went home crying. and that was where it ended. after that i felt very self conciouss about myself and him doing that kind of scarred me. then after that in the beginning of eight grade i liked this guy and he wanted to hang out w. me. i said okay and when i got to the park to meet up with him he was with his friends and his friends were likee " thats the girl" dude she has no hooters and eventually the guy left and i was walking home and his friends followed me and were yellingg HOOTERS at me. also i liked this other guy and he told my friend the only reason he didnt like me was cause i didnt have big boobs and a big ***, now im completly self consiouss about myself and none of my friends seem to understand they keep yelling at me everytime i go how do i look or something , they yell likee "you look fine wtf ur really pretty stop worrying about how u look" and my bestfriend like told me to get over it it happened a long time ago and i honestly dont know what to do because i feel like nobody knows what im going through and it really pisses me off because how could guys justt likee do that?!