ADHD manifests differently in everyone so the sooner we all realize, accept and openly discuss that, the sooner we can help someone (maybe even ourselves) from feeling like an imposter. Or even help them recognize their own ADHD traits!
I think about this a lot. I felt like an imposter when I was first diagnosed. I didn't understand how complex ADHD actually is. The stereotypes surrounding ADHD were so strong and I had never known anything about ADHD other than what I had been exposed to already.
You DON'T have to experience ADHD like everyone else to be ADHD. Even during the diagnosis process, they have a list of traits that one COULD exhibit, but not everyone will have the same selection of traits.
You don't need to relate to every piece of ADHD content you see on the internet to be ADHD. And honestly, the moment I realized that was so freeing.
And last but not least: NOT EVERY BIT OF ADVICE IS GOING TO WORK FOR EVERYONE. What might work for me, might not work for you. Listen to what helps other people, but follow what you find works for YOU.