Is it normal to not be able to pay attention

I was never diagnosed with adhd, but I suspect I have it. I can't stop moving around or squirming, I can't pay attention during conversations I don't feel like having, I daydream to the point where I forget the most important things, and can be really irritable. If im even slightly not interested in something I completely ignore it, even people when they're trying to talk to me. I have a really powerful mind though, and I don't have issues learning anything. Things dont even bother me, even when people get mad at me not listening. I just kinda shrug it off...not to be rude, but just because I wouldn't mind if someone did that to me too. Treat others like you want to be treated right?