I just turned 16, I'm 5'2 and my penis is only 4" erect. My doctor said I should have gotten taller in 8th grade but now I am a junior. I can't cum and I only have a few hairs under my arms and around my penis. No facial hair whatsoever. Please tell me what I should do. I want to get injections, my friend was 4'7 in 8th and he got injections now he is 6'2