Many years ago, a shrinking virus struck the world. When this virus hit, it shrunk all of the men in the world and some women who were unlucky enough to catch said virus.
The people who shrunk were now about 3 to 5 inches tall and were now called tinies. The world has changed a lot to accommodate tinies and numerous adjustments were made to a wide variety of things in everyone's daily life to help those who had been struck by the virus.
As an added side effect, the women who caught the virus but were somehow lucky enough to not be shrunk received very large boosts to their size of their breasts, butts, hips and thighs to the point where most women who weren't shrunk the virus were curvy beyond belief. Furthermore, tinies were nearly indestructible, which meant that they could be crushed and not be gravely injured (but they could still feel pain). Due to this, it is often common to see tinies being crushed by normal sized women and being stuck to their feet (or any other part of their body) or trapped inside of their clothes especially if a normal sized woman didn't notice them.
You are unfortunately one of the many people who caught the shrinking virus and shrunk down.