Play

You like to play with your penis because it feels really good, as you know. This is a natural part of being human. We're built so that sex activity feels really good to us, so we'll do it a lot, and thus make babies even if we don't know that sex causes them.
The pleasure reward for doing sex is very strong, and can be very bewildering and even a little frightening for young people when they discover it. Masturbating often is a natural reaction to this, and is not wrong or bad. In fact, it helps you learn how your body works, what feels good to you in sex, and how to control your sexual response; as long as you pay attention to what is happening to you when you masturbate. Masturbating regularly is also healthy after you're familiar with your body's reactions. It helps keep your sexual organs toned and in good working order.