Curing Symptoms - Some Suggestions

I'm actually super confused if I've got ADHD or not. Honestly, my brain just won't stay focused for long periods and it feels like there's this constant restlessness inside me. When I was younger, my parents had to keep an eye on me all the time-like, constantly monitoring stuff. And now, even when things are quiet, I can still sense every little step someone takes near me or hear a car horn from far away as if it's right next door.This is probably just some ADHD stuff going on, but who knows? Anyway, does anyone else deal with this kind of thing?