About masturbation, why didn't anyone tell the truth and tell others that masturbation is normal?

In fact, it's hard to say, and many people don't want to say that masturbation is abnormal. But as a young man, most of them have the habit of masturbating. Basically, it doesn't hurt much. Just some protein in the upper body. So I have this habit. I don't know. But it can also solve temporary pain. But for a long time. It is still harmful to health.