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You can't possibly know this.
"people" refers to humans so we are indeed sure
or are we?
Yeah. What if someone went into a black hole, broke newtonian physics (which apparently happens quite often around singularities), ended up going back in time (we're not sure it's completely impossible), and now there's a colony ship of 9 billion people on the other side of the universe? We couldn't possibly know for sure. And if in fact the universe is infinitely large and time goes on forever, then if it's possible it's almost likely. But now we're getting into the multiverse thing...
If the universe is infinite, does that imply infinite possibility?
Yes... Yes it does. Which can cause a lot of paradoxes...
Another version of us is out there wondering if we exist. We too are wondering if we exist.
So are they!
Have you checked?