Why some people think they are the center of the universe?

(From someone who does) In my case, I have a lot of my life left ahead of me, my imagination takes my future possibilties and blows them out of proportions. I then base myself on the most successful of these. If I believe I am going to become that future self, who in my mind is the center of the universe, then it explains why I act as if I allready am. We are the same person, but seperated by reality and the restriction of time. Probably not the answer you were looking for, but I mean hey, I think im the center of the universe, so it must have been.