My official diagnosis is "atypical cystic fibrosis." Does that matter? It could be ADHD. It could be ASD. There are plenty of things that can significantly interfere with your functioning that can be missed, especially if you are above average intelligence.
Twice exceptional individuals very often have seemingly "average" performance outcomes and the degree to which it tortures them to just achieve "average" goes largely unnoticed by people who presume them to have an excess of ego for thinking they deserve something better in life.