Do masturbation affect your height?

No: Masturbation will have nothing to do with your weight or height.

No: This was made up by misguided people to frighten you. The supposed mechanism -- a testosterone surge closing your growth plates -- just isn't true. In fact, it's actually Estrogens late in puberty that stop bone growth. Enjoy your body, think about something nice -- maybe even being married someday -- and vary your technique to prepare for different possible partners.