That's the thing, you don't have to quit. Not unless you're doing it all the time and it's interfering with your school, family or social life, etc.
Probably not, so I wouldn't worry about it. This is just something people do because they have perfectly normal sexual urges. Well, they masturbate or have sex.
Oh, and there's no reason to talk to your parents about it - unless, as I said, it's interfering with your school/life/family etc.