Its impossible to know what shape the universe is(and it depends on definition of many things). But if there is one spot of origin(big bang) and the boundaries of the universe is defined by where the light has traveled the furthest away, then the universe is the same shape as the big bang was. However imo its stupid to talk of the shape by its boundaries, because there is a lot of mass inside the universe and those are in the shape aswell, then the shape of the universe is the shape of all its material contents(including this keyboard im typing with and black holes etc.). But again the mass in the universe isnt shaped as we perceive it(or how we are even able to comprehend it), but is energy in quantum state(which just manifests itself in macro scale in particular ways, but which isnt the actual reality) which interacts with other energy by basic forces of nature and its impossible to give shape to this energy in a quantum state.
You should start by thinking about questions that can be answered at least with some probability, then when you find probable answers to those questions, then you can start to hypothesize answers to bigger questions(but this question is just impossible to answer).
edit. also we dont even know if we exist in the edges of the universe(holographic universe http://www.youtube.com/watch?v=2DIl3Hfh9tY ) or inside of it as we have theorized for centuries.