Exactly the same experience here.
I have ADHD. Caffeine seems to give me a parallel (albeit lesser overall) experience to taking my prescribed Adderall.
Most people around me have diagnosed ADHD, makes me wonder if the reason why I'm in such a group is because I have ADHD as well, but I don't really care for medication as I never had issues handling it on my own so not planning on getting diagnosed.
And if I do, I actually prefer it since it allows me to go on for days without a break discovering solutions to very hard problems.