The world that you know exists within your head. You are the one that is responsible for building and maintaining that world. We all know some folk that seem to live in a world that doesn't make any sense to us at all. It is very likely that it does make sense to them.
At first, our parents are very interested in helping us create a world that is very much like their own within us. As their influence is diluted with other influences we begin to create a world which is very much our own creation. But, the important thing to remember is that we have a responsibility to ourselves to build the best possible world making is more likely that we will be able to achieve our goals.
Be careful what you put into your world.