I just got diagnosed with ADHD combined type. Looking back, my entire life was a total mess before starting treatment. Little to no concentration abilities make you lose focus on your surroundings so much that it can affect your ability to eat and sleep on a consistent basis (not to mention employability). You sort of just sit there mentally screaming at your body to get up and move. Or you mentally scream at your body to stop moving and sit down. Bottom line is that you have almost no control over your attention in every way. Your head is also in a constant fog because you aren't able to maintain focus on what's going on in front of you.

If you see yourself with constant attention issues even in an optimal environment, please see a doctor. ADHD and other associated conditions can ruin your life if left untreated.