I can relate to this. I can't ever seem to focus on anything other than what holds my immediate interest. It can obviously make things like school very difficult, when even a class that you enjoy becomes uninteresting if something else occupies your attention. May be, ADD, maybe something else. Maybe the effects of the information age on humanity. Rapid information cycling has most definitely stunted my attention span. I don't really know what the cure is for this, or if there even is one. Maybe try calming exercises like meditation, find environments free from distraction such as libraries.