how do i know if i have ADD?!
Despite what many people will tell you, ADD is not a disease. There is no test for it. Some people just have trouble concentrating. If your concentration severely affects you lifestyle then see a doctor. Since there is no test for it, different doctors will diagnose differently. There are medications out there for it, but the side effects could be more of a nucience than your condition. In my opinion, only seek medication if it is seriously affecting your lifestyle.
Get tested by someone qualified.