I am a male, 16 years old, 170cm tall with little hair under my armpits, but pubic hair. I hit puberty at 14, but my armpit hair hasn't increased ever since. My penis and testicles are ok size, but I have friends that are bigger. My nipples haven't come out and I am scared I do not produce enough testosterone (I have sperm production and a streamline of hair is growing under my belly button.) Is my testosterone production low? I Am scared I will stop growing and will always remain physically small. Please help.