So I have a 1-2 inch flaccid penis, and 4.5 inches when erect. I am 17 years old, and I'm pretty sure that I have had no genital growth(penis/testes) at all during puberty, so maybe I have low testosterone or something? Also, I lift weights but I can't seem to grow much muscle at all, and I understand that testosterone is a big factor in muscle growth. Any help will be appreciated!