Blawn programming language (created by 15 years old boy)
github.com
github.com
However, looking back I'm glad I was screwing around with friends at that age. Setting stuff on fire, doing stupid stuff like exploiting MegaUpload, building spud cannons and making pyrotechnic effects for my school's theater (commercial grade "flash" powder is awesome, especially when the school buys a pound of it and lets you keep what's leftover ;) ).
Sometimes I'm glad I wasn't too focused or smart in high school because it means I have a few good friends and a childhood to look back on. Granted, I still enjoyed competing and placing nationally in the Intel ISEF and Siemens Competition in HS.