Depends really on your age and circumstances.
Most teenage boys masturbate regularly with no harmful side effects. But it can lead to a secular lifestyle.
My advice help yourself when you feel the need, in private of course. But try and save it,two or three times a week, waiting can make the experience better.
Best advice would be to find yourself a girlfriend. Nothing beats the real thing.
And I guess the same goes for girls. Except find a boyfriend !!!