Do shy girls realize that they come off as not interested a lot?

I'm glad over the years I've been able to pick up the subtleties of when a woman is a bit nervous or shy around you but still has interest

But a lot of girls try too much to act uninterested/cool/unfazed when they're shy/nervous around a guy they like; Do they realize that a guy that was initially flirting with them backs off a lot of times because of how she's acting?

They must know they're being too subtle about it or acting the wrong way and that causes the guy to give up a lot of times
Do shy girls realize that they come off as not interested a lot?
Post Opinion