What I'm trying to say is, wouldn't our belief shape our reality? If we think "there is nothing" there will BE nothing. If we think "ghosts exist" then they WILL exist. ???
This has been an ongoing philisophical topic for hundreds of years. You'd probably do well to read into phenomenology, which is a from of rigorous inquiry that dispenses with requirements of rational objectivism as employed by modernist thinkers. Or rather, it can be described as objectivism within ones' own frame of reference or experience, a discovery of being itself, rather than the discovery and explanation of just things. Start with Heideggers "Being and Time," then on to Husserl's writings.
However, what you posit is more radical... that our experience literally changes the world. This is physically impossible, since we are all undeniably living in the same world. For your theory to be true, we would have to each be living in a seperate universe, but somehow have our physical existences overlapping... that too, is a high proposition, and I don't think the tenets of basic subjectivism are near enough to support it.