We create our reality. The world is only potential possibilities that we actively collapse into our own point of view. We are the observer and the observation. There is nothing external to us—only our consciousness that defines our reality.
We only know what we know. Our only limitations are bound by our own thinking patterns. We do not have to become anything, only be, create.
Current science can prove a lot of this already. Quantum physics is part of the explanations and a new movie is telling about the issue very lively and in an illustrative format: What the bleep do we (k)now?. You can even buy it from Amazon (note that it is region coded to 1 (US and Canada)).