Hi, I Am 22 Year Old Male. I Never Had

Hi, I am 22 year old male. I never had sex before. I masterbrated a lot in early teen years but now i have reduced it to 2-3 times a month. But now i am having nightfall twice in a month and my penis head is dry and there small bumps which appears and disappears periodically. I want advice on how get rid of nightfall and how to have a smooth penis head.