I had held off getting tested for ADHD because I was convinced I was just lazy and didn't like schoolwork but once I noticed I couldn't play a single videogame for more than 15 minutes at a time and had to do something else, I got myself tested and ultimately diagnosed.
I still remember the first day I took the medication, it was like somebody finally turned off a white noise machine in my brain and I could finally do all the things I've wanted to do.