Welcome to HCM
We understand your concerns
Your nipples problem is not worth addressing mainly because it is so common and is not a problem at all. Men nipples get erected when we have goose bumps. Try it whenever you want nipple erection.
Moustache and beard are mostly hereditery as well as geographical. Nothing to worry about your manliness. Just shave daily and you will get the result.Masturbation
and hair growth has no direct relationship. Excessive masturbation is harmful. Now is correct. But don't worry about your sexual potential. Just be a man.
Wish you good future.