Hi, i grow hair randomly. for example, i get lone whiskers under my chin, and in places on the side of face. also, grow random hair on nipple. why?

Sounds normal: I understand you're a teen and you are surely just getting your body hair. Chest hair starts on and around your nipples; your beard starts under your chin. Congratulations on your milestone, and the new joys and responsibilities that it promises. If dad's a reasonable guy, maybe you can talk with him about this stuff -- i bet he'd like to.