There have been many articles, videos, etc. where I have encountered a philosophy similar to the following, so I'm sure it has a name, I'm just unable to find it and therefore to read up a bit more about it. Here goes:
Reality is relative, there is no absolute frame of reference. The only thing that exists is me, and 'my' universe is what I believe it to be. There is no such thing as 'the' universe. When I change my mind about something, reality changes to accommodate it, and when I learn something new, it spontaneously comes into existence. Basically, if a tree falls in a forest but i haven't seen it before, the tree doesn't even exist. If I have seen it before, but I don't hear it fall, then it didn't fall.
I have read a bit about postmodernism and it seems kinda similar, but I don't think its the same. Is there a name for this?