Why is everyone so ashamed to wear their actual size?

It’s ok to not fit into an XS or a kid’s size 16. Like there’s nothing shameful about it so I’m not sure why there is such an influx of women cramming themselves into the smallest sizes possible? It looks uncomfortable and ridiculous. I know I’m a large. I’m not going to shove myself into a smaller size to prove that I can. I’ll take comfort any day