Hello everyone, I am sixteen years old and I hit puberty at 14 years and for months.My problem is that I don't have mustache, beard, and hair on my arms, and I also think that my penis is not fully grown. I have hairs on my legs, pubic hair and some armpit hair. i can normally ejaculate and I have many erections, but I think that the amount of semen in each ejaculation is no a lot. I only know that my problem didn't have mustache and beard until the age of 25 after he was treated in France. Does it have to do with genetics or is it because of low levels of testosterone . I don't know what to do can any body tell me.