"is that a symptom?"

I was diagnosed a few months ago and having learning about ADHD and all it's symptoms and manifestations.

I think one of the hardest things is trying to figure out what are symptoms and what are regular human things since I clearly don't have a frame of reference for what's neurotypical.

I was wondering what symptoms you've had trouble with determining? Also, what do you do when you get the 'everyone does that' scenario? I want to be ready when it happens