Does size matter to relativity?

Question

Here’s a thought experiment. 

Theorize that we shrink you to half your size. Now is a foot still a foot or is it really six inches or 24 inches to you? Does that not change your space time quantum? Or are we so egotistical that what we see as space, size and time should be the same no matter what size anything is? The theory of relativity only addresses “distance and time” should size not be a factor when calculation are. Time is relative only to us. 

Answer 1

An interesting closely related question is how to ensure that (special) relativity is compatible with the existence of minimal (Planck) length. Perhaps the best known attempt to reconcile the two is the deformed special relativity.