Here's something which will make you heads hurt even more
Considering that in order to explain the Standard Model as it is, in terms of String Theory and Supersymmetry, we need 11 dimensions in spacetime. Then the dimensions we live in and experience are just a tiny fraction of what really exists. In fact, according to theory, the Universe we inhabit is nothing more than the surface of a higher dimensional object floating around in an even higher dimensional space (a space of all spaces....a superspace).