Does Having Good Grades automatically disqualify the possibility of ADHD?

So I haven't taken an ADHD diagnosis with a good doctor yet but thought a kinda good octor would help. He asked me some stuff about my family and age then immediately studies. I am considered a good student and expect 3.9 GPA is my finals. I told him how I had a hard time being focused, starting my tasks, and couldn't do stuff that I really could and started to do. I still am unsure that I do have ADHD cause I used to do stuff related to my studies extensively even when i didn't need to when I got around to it or something- I don't know what would happen.

I am sure I am not making excuses but as a logical minded person his reasoning seems really off to me.