Let me put this way if universe is infinite,why we consider things huge and small in comparison to us.What if these physics theories hold only in this universe which may be a single cell of a huge huge body and we can never imagine or think what's outside. I think we have misjudged and mislead by our own existence and by taking things relative to our own size and location
For a living bacteria or any micro organism the rules and laws of physics may be the same but it will consider in traveling at a phenomenal speed in respect to it's own to travel out side the body, if it knows there is any universe out side it.