I was diagnosed with ADHD as an adult, and unless it's actually having a negative impact on your life, I wouldn't bother trying to get it treated. I saw a therapist because I was really struggling with college, like taking an hour to read a single page in a textbook because I would get distracted and forget what I read.

Personally, my ritalin prescription makes me irritable so I take a reduced dose when I'm not actively working on things. My wife has told me that she prefers my personality when I don't take the medication.

Finally, and take this with a grain of salt because I'm not a doctor of any sort, but I don't think having ADHD is necessarily a problem, and is more a problem with how society expects people to spend their life sitting still and focusing on one thing all day.