I posted an article about this, but ways "gifted" ADHD pass as high functioning is by using adrenaline to kick in gear. That means developing OCD like behaviors centered around anger, self hate & panic (aka anxiety). You learn acceptance and praise comes from a hell you create.
Beyond the torment ofADHD symptoms, add the additional criticisms of "we KNOW you're smart" "you're WAY too intelligent for this" and "why aren't you working up to your full potential?"
Then turn those internal and they are your internal diaglouge forever. So there's your gift.