If you can hyper focus to the point of tuning everything out, then you probably dont have it.
Everyone shows some symptoms of ADD, like restlessness, unable to pay attention, and so forth, and I have heard everyone and their mother say they have it. Its best to talk to a professional, and not "self Diagnose" like half the world.
Common misconception, Chainers, to assume that someone with ADHD spectrum can't hyper-focus. When we were trying to figure what exactly was going on in my son's head I insisted he couldn't have ADD because he was able to hyper-focus to the Nth degree when he played with Lego. The psychologist said that aspect was actually a clue to her that my son did fall within the spectrum because a lot of ADD kids can hyper-focus on specific task, usually thngs that highly interest them. (Obviously that wasn't the only symptom my son had.)
If I recall correctly people with ADD/ADHD actually do quite well in certain careers and the ability to hyper-focus in certain areas was suggested as being one reason why they could suceed.
One example was emergency medicine. The psychologist suggested that ADD kids are bombarded with stimuli constantly ("a million things at once") and they struggle to keep stuff in focus and they, by necessity, must learn to do so in ways that "normal" people don't have to. In an emergency setting the ability to hyper-focus on the task on hand when information might be flying at you from every direction is obviously a benefit.