I recently read Fish in a Tree. It’s about a girl who discovers she has dyslexia in 8th grade, but I totally related to it having grown up not knowing I had ADHD. Not exactly the same, but similar emotions and themes.
I’ve also heard about the Joey Pigza series about a funny, determined, hyperactive boy with ADHD. It’s on my to read list. https://www.amazon.com/Joey-Pigza-Swallowed-Jack-Gantos/dp/1250061687/ref=sr_1_1?s=books&ie=UTF8&qid=1543303648&sr=1-1&keywords=joey+pigza