wow. well i would think they are mesuring wrong with 3.5 but i could be wrong. there is a possibility that he may be gay. but there is a bigger possibility that he is just curious. and you have an average adult penis so it probably wont grow anymore. but people grow at different times so he may have started pubes first and then next will be dick and balls. but obviously you started with your dick and balls growing first so yeah. i hope that helped. if it didnt just tell me and i will explain it better.