What should i do ????

every time i go out older guys keep trying to talk to me they say things like come over here shorty or i like the way you walkin let me talk to you Ect. im 15 about to be 16 but my body looks a little older. i want nothing to do with them one time one of them touched me. i get really annoyed and i try to ignore them what should i do so they can leave me alone?