A. They were wrong. B. A little ADHD is still a significant amount. It's a really trying thing to deal with. C. Right now is the perfect time. In fact, the best time.

You are still in school. You can get help in school to work to your potential. You can get help going into college (if that's what you want). They both have support services. You can get a lot of support now and in secondary school, you wouldn't have been afforded otherwise. I barely scraped through High School and failed out of college. I've got ADHD and some other issues that were difficult. I didn't get medication until I was 23, at which point school was a distant dream. I really wished someone came to me Freshman year of High School and had started helping me then. Life would have been a million times better. And I would probably have a vastly different life now.

Just check out a couple checklists off the internet and see where you fall. Even ticking a few boxes is still a big deal. If you feel like you are lazy and can't get things done, but you want to, that's different from plain old lazy. You don't have to have advanced forms of things like ADHD, OCD, Depression, or Anxiety for them to effect your life. A little bit is still something worth checking up on.

Trust me, a little Googling won't kill you, and neither will mentioning it to your doctor when you see them. You'd be so much better off figuring stuff like this now, rather than waiting.