Your frame is probably smaller because you're Korean. You look quite thin to me
. Many of the women here look extremely underweight to me, but I guess that's ideal here. It's really hard to get a sense of size, here, for me at least! I'm nearly 5'10 and can finally buy shirts in Japan and they fit everywhere but the elbows and sometimes the shoulders are too narrow! So I'm guessing we're built a little differently
.