[trippy_biscuits]

Congratulations. Now you know your brain just doesn't work like the typical brain. And that's a good thing. You can see things differently even if there are times when you can't see things the same way the typical person sees them (social cues, body language, but you can still learn to pick those up). Use ADD to your advantage. I'm at least twice your age, but had a similar experience at your age. I'm still trying to finish school but it didn't stop me from developing a career as a software engineer. I can personally attest that exercise and the "no sugar/low carb/paleo diet" mentioned by Dylan. Ambient and trance can also help at times. Lists, small goal, small breaks, help you practice focus. Medicine can help, but only in combination with behavioral therapy. Medicine has side effects, too. Many things will be harder for you to accomplish in a given amount of time while other times you'll be amazed that others are so slow. If your ADD is documented and you are being treated by a medical professional, you can get extra time for assignments, lecture notes in advance, and other accommodations like a private room for exams where you can read out loud along with extended time limits. ADD isn't a limiter to your personal success and happiness. It's a challenge to which you adjust.