Hey I wouldnt be so sure you don't have ADD, I got diagnosed with it in college. One of the neat things about ADD is you actually can do things much quicker (your brain runs a thousand miles per hour), becuase of that I never new I had it through high school becuase i could do all my homework in 20 minutes and get A's on most stuff. Didnt find out until i was at UCLA trying to do work that for once in my life took more than 20 minutes. First 20 I was fine, after that god (or may I say adderall help me).
It might not hurt just to take a diagnostic test to see if you have Adult ADD, in the slight chance you have it, there are alot of things in your life that can probably become much better that you dont even realise at the moment.