Similar for my approach (although I haven't been diagnosed with ADHD). This is how I learned electronics enough to manage becoming a certified electrical engineer without ever officially studying anything even remotely like it. I was in the exam with people who did this professionally for half of their lives. This is also how I learned anything I ever did as a freelancer, including sound mixing for movies, VFX work, color grading, programming: I was curious about it, I was young, had time and just followed my interest. It is still how I learn new things, only now all the knowledge from other domains helps me doing it even faster.

The trick is to play judo instead of karate with your own drive. Instead of trying to stop your urge and force yourself to do the boring stuff, it can work to take your energy and just slightly redirect it to where you want to go and where it makes sense for you to go. Maybe you have the urge to play a video game and can redirect it to reading a book like homo ludens instead, or maybe you redirect it towards making a game? Even if you never finished it you learned something.