When I was a junior in college I tried speed. It calmed me down and gave me focus. But since I liked the effects of speed so much I stopped before I really got started.

I thought about the calmness, peace and focus for listening and responding the drug gave me. "I knew" that I could cultivate that feeling in me. I worked at it and within 10 years I mastered calmness more or less. I did it through inner spiritual work and meditation.

Did I have ADHD? Maybe. Maybe a mild case of it. If I did it wasn't something I wanted anyone to know about.