When I was yet to be born, I chose the Jack of All Trades prestige class, and to compensate, I added ADHD. Meaning I never took interest in school and always could be considered an autodidact. Some people say I am good with whatever I choose do, but I can't agree on that: I'm adequate in most things, really good in some, but never that great anywhere, TBH.
That said, the discipline I chose is computer programming. This is what I love doing, whether it's optimizing old assembly code or learning how to fiddle the latest ARKit.