Young people nowadays have so many things to cause distraction. When I was younger, we didn't have cellphones and the numerous electronic related items that cause you to lose focus. Try eliminating everything but the necessities, and then focusing on one thing at a time. Even if you get distracted, set a goal of going back to it even if it is for a very short amount of time. Just like a tree, keep chipping away at it, and eventually you will make it fall. You can go for medication, however, they can cause dependency, and can cause more issues in the long run.