I am 25 years old my weight is 50 my question is how to stop masturbating and is it harmful for health please suggest me?

I hope U weigh 50kg: You would have to be midget if only weigh 50lbs. Masturbation is by and large a healthy activity unless it becomes an obsession and interferes with your daily life. Best way to stop or reduce masturbation is suitable partner, if you so wish. Good luck.

Enjoy yourself: Enjoying your body while you're alone makes it possible for you to stay comfortable and focused and able to do other things -- perhaps even get to sleep. It also prepares you for adult roles. Think about that one special person who may be in your future. It won't make you stupid, weak, infertile, bald, or any of the other things you've been warned about. Best wishes