I was goofing off when I brought up women, but if we're going to talk about them seriously:
1) Kriss, you're a tall and fit white guy living in an Asian country, you must be killing it. If you think that women are not that complicated, it's because you're playing that game on easy mode.
2) Fazchenyuk, my general impression is that younger girls care relatively more about face, and as they age they care more and more about physique and stature.
Not talking about randoms to get in the sack, this is more about girls you're really attracted to. It can be unnerving for anyone because you have this feeling of attraction that's higher than usual so you don't want to look like a clown.
Girls are not easy, and they're definitely complicated creatures..but really it's that simple, build up the courage to go talk to them. If your personalities match then great, if not, then actually it's also good as you can move on and at least know.
Girls respond to confidence. I don't know what's wire in their brain exactly but that is the #1 thing they look for...from my personal experience. Of course, you will always have outliers..girls who categorically won't talk to any guy under 5'8...or ginger boys...or any non-bodybuilder jacked up...
Most girls though, it's about confidence. Not to be confused with arrogance. You can be shy and still have the confidence to go talk to a girl. They'll love that.
I've never had issues getting girls but every guy meets that girl once in a while that makes him extra shy. Two of my exes and my current girlfriend will tell you I was so shy when I first approached them. Twitching a bit..turning red..avoiding some eye contact...Of course in my head, I was on top of my shit so no idea what they're babbling on about, but maybe they're not entirely wrong..lol
So it depends man, but end of the day, just go talk to them. There's no other way.