Mother nature designed the human being to walk barefoot over earth, mud, rocks, slime, dead things, things that are not dead, bugs, worms, miniature aliens on a short visit from
the planet
xenon, etc. Your paranoia about stepping on
the sidewalk
is nonsense on toast. I'm not going to humor you by saying you have legitimate fears. Psychiatrists prescribe drugs and I'm not sure that's what you need.
A person does not always get an infection from a skin puncture.