Am i stopping my own growth? im 15 years old junior in high school?

im on the varsity cross country team at my high school. i started working out last summer when i got push-up bars and 20 pound weights for my birthday. i worked out about 3 times a week and got some good results. this year, all my friends on the team and in cl say "yo, man you're ripped" and jokingly call me the steroid man (no i don't take steroids). well anyways, i felt good about myself. but my friend Jose told me all my working out will stop my growth. i thought he was just jealous cuz he's kind of a fat guy. but now im kind of insecure. i don't want to be a short stubby man (right now im about 5"7) when i grow up.