How to stop masturbating?

This depends. Why do you want to stop? do you feel it is becoming an addiction? Is it a religious or cultural issue which you are taught it is wrong to do? Is it a partner requesting that it stop? The reason why you want to stop will bring a different response. Overall, masturbating is normal and ok, unless it is having a negative impact on your mental health, or your relationships, or life in general. Understanding why you want or need to stop will help how you can stop.