Meh, if you're a teen, you're probably just getting familiar with having a sex drive. It's new it's fun, it's exciting.
I say fair enough as when I discovered it, I was like "Oh my god, this new thing is bloody amazing, how couldnt I have known this exists before" and consequently did it a few times a day.
Now I feel like an old woman (in my mid-20s) and sex doesnt excite or interest me. Thanks antidepressants!