Hi,
I am 21 yes old. I feel like my penis is so small, really want it to grow more. This depression arised since I saw my dad's penis some 2 years back. At home many times I have seen my dad wandering here and there naked, he has got a big penis. Being his son I should have inherited his size, but I have such a small penis which is almost half the size he has. I really worried about this, kindly guide me with some excersice to grow up my penis.