The malnourished, 1 ft shorter than their S. Korean counterpart troops?

Yep! There’s a surplus of educated women, who are too educated / accomplished in their careers to want to marry uneducated rural men. And many of them also deferred marriage for their education and career and thus became a bit too old to bear children. All of this just exacerbates the male to female ratio problem in China, which is also a huge problem for China’s demographics.

China is going to shrink in population, Japan, Korea, Taiwan also have these problems.

Same here. I am introverted and I hate social interactions. It drains me. BUT for me, after talking and meeting a person face-to-face a few times, all the rest of the online communication becomes a lot more smooth-sailing.