I’m afraid things are just a little bit more complicated than that.
It is true that we need our conscience in order to perceive matter but that doesn’t mean that we actually create matter when we perceive it.
The short (and long) of this is that matter existed long before monkeys started walking consciously on this Earth.

Humberto Maturana did a jolly good job at explaining all this: http://www.univie.ac.at/constructivism/pub/hvf/papers/maturana05selfconsciousness.html