Matter didn't exist. The singularity was a "point" in 0-dimensional space. Basically, it was "nothing":"the universe began when both its gravitational energy and kinetic energy were arbitrarily close to zero. It literally began from nothing..." from p. 137 of Silk, J (2006). Infinite Cosmos: Questions from the Frontiers of Cosmology. Oxford: Oxford University Press. Additionally, even after the big bang, there wasn't matter (or rather, matter and energy were not seperate). That came a bit later. In the beginning, none of the physical laws governing the universe existed. As Yulsman put it (Institute of Physics Publishing, 2002): "In the very early universe, phase changes in the primordial soup did not involve molecules or atoms, which didnt exist yet. Instead, they involved transitions from a universe dominated by the grand unified force to one dominated by the multiple forces we know today."But just to be clear, even though the universe did not exist before the big bang, all matter and energy did; that was what made up the singularity.