It's a miracle that anybody survives being a teenager. With hormones all ablaze, everything feels imbued with the utmost importance, as every moment is the one that will define the rest of your life.
Being a teenager is about learning new things and testing new limits, often without parental supervision. There are some secrets that teenagers keep from their parents long after they're adults, and it's easy to see why. A Reddit thread asked, "What is something you did on your teenage years that you would never tell your parents?" It's full of stories that don't belong at family dinners but definitely belong on the internet.
Beware: many of the answers are NSFW. Congrats to these adults on having been sexually active teens.
I legit used Photoshop to change my grades on a bad report card once. They never figured it out.
My little brother (a year younger) would get condoms from me because he was afraid to ask our folks, the only reason I was allowed to get them was I'd been dated the same girl since middle school. I'm the reason you don't have like 8 grand kids from him.