You left out… whether you had fun? Because it sounds like you feel your teenage hobby should have been a productive and focused use of your time leading to some kind of useful product. Which seems like a pretty high bar to set, and, like, besides the point?
I was around 14 when I first heard about Haskell, I didn’t know anything about it, functional programming, type theory, lambda calculus or anything related. I just knew it was a programming language. Nowadays I see people around that age programming relatively fluently with it.
All the actual programming I ever did as a kid was make terrible websites, console apps that did nothing useful in particular and a few desktop app shells that did the same. I was probably around 17 before I did anything “serious” and even at that point it wasn’t great.
Now I’m not very old, so I’m not sure if it was simply the environment I was in, but I didn’t know that many other people that were into programming when I was a teenager, even with the internet and all I was normally the youngest guy in every chat/forum/site/group I was on. Nowadays though, I know several teenagers that could code circles around me.