I feel as though I am destined for greatness.?

I have these very optimistic visions of myself in the future. In these visions or premonitions if you will I am wealthy, and famous. I feel as though I will create or invent something "big". I look to other famous historical figures for inspiration and I compare myself to them, historical figures such as, Julius Caesar, Alexander the Great, Hannibal Barca, and Napoleon Bonaparte. I want to be remembered by history forever just as they were. Sometimes I can't sleep because I get all these thoughts in my head about myself. I wonder if I am not alone in this thinking. Do most people believe they will be successful in the future?