i feel taken advantage of

my friends are very handsy. they randomly decided it's okay if they grab my chest or ass, and i've made it obvious i'm uncomfortable but they won't quit. i'm so confused and i feel ashamed of my body, which i used to be proud of. i've had so many friends take advantage of me. they think it's okay since i'm heavy chested and that "it's like i'm asking for it." that it's "funny" or "quirky" that they touch me like this. my clothes have been on in every situation but i feel so naked either way. they aren't even really my friends, they treat me like shit, and i've been trying to cut them off for a while. anybody else been in a situation similar to mine?