Well, the best way to know for sure is to get diagnosed :), although I believe this problem is waaaay overdiagnosed today because of the pharmaceutical lobby. So many people especially kids now take these unnecessary pills which make their heads even more messy. I decided not to take this route, and instead make an advantage from my ADD. For example hyperfocus is one of the common traits people with ADD have ,and allows you to be extremely focused on things you like for many hours and don’t get tired at all. On the other side when there is something you don’t enjoy - like reading a book in this case :) it is sometimes very hard to stay focused. In my case a diet has a big impact as well.