They are called Pearly papules and are natural and nothing to worry about. you can get them surgically removed if you want.
After viewing hundreds of pictures of penises on here and responding to hundreds of posts on here I can assure you that there is nothing unusual with what is shown in the photos.
Sexual function and masturbation is something many men think about in terms of too much, so, unless you are spending hours per-day, or most days masturbating then this is not usually a problem that healthy penile skin can deal with. As I say, your penile skin certainly looks healthy enough