really deep stuff...

True, but hell, maybe we were all created 5 seconds ago with all memories intact, a whole universe made to look 14 billion years old. The question is, how likely is that? Maybe you can't prove it one way or the other, but it is far far far more likely that there is one reality which we all take part in. Not that this "occam's razor" idea PROVES anything, but seriously, give it some thought and ask yourself what is really the most likely explaination. Is there any evidence that we each have our own universe that we alone control? Is there evidence that we all share one reality? You be the judge.