Most people have a couple of these but it isnt to the point where they cant function. ADHD is the point where it does.

An ADHD brain is essentially interest driven. It isnt so much a lack of attention and focus but missapplied attention and focus. The reason for this is thought to be a chemical imbalance of dopamine and norepinephrine. Dopamine is tied to motivation and norepinephrine is essentially the fight or flight neurotransmitter. This is why people with ADHD tend to have little issue focusing on a fun task or a task that is urgent and induces considerable stress. The former raises levels of dopamine and the latter norepinephrine. It is also why the first line drug treatments involve stimulents which help normalize both of these.

If the behaviors that you see in yourself are causing distress, you may want to ask your doctor/mental health provider to be assessed. That said, I would keep in mind that it is usually not cheap and if that is a significant barrier for you, look for pay as you can mental health providers in your area if they exist