> ADHD is the condition where there are many problems around and you cannot decide which ones are really worth solving, so you spend some effort on most of them but solve none.

What you described here has nothing to do with ADHD. You described a situation, a problem solving strategy and an outcome. That says nothing about the brain involved, or its functioning.

ADHD is a particular state of a nervous system, one of over stimulation/over excitation in one end and under stimulation in another. You can see it on an EEG, excess beta waves (among other things). You can see it as a neurotransmitter inbalance, neuroinhibitors not working properly.

But besides, the functioning of a brain and the environment it finds itself in are two interested things. But of course there is some influence between them.