How to avoid masturbating?

Other motivation: Assuming it is causing a disruption to your social / work / other activites--you have to force yourself at first to go and do something else--be active, do homework / housework / work-work, etc. If only occasional, there is no significant downside, you just must work the moderation aspect of it.

Why do you ask?: Especially at your age, it's basically not possible for you not to enjoy your body and relieve the pressure from time to time. If you've tried "heroic abstinence", you've probably discovered that within a few days, you can't even get to sleep or focus on your work. It's healthy and part of growing into adult life. If you've obsessed with erotica and missing out on life, get with your doctor.