I don't think it's just a woman's issue. I've struggled with this myself until recently when I got 3 out of the 4 jobs I applied to a couple weeks after getting laid off.
Impostor syndrome applies to everyone who still lacks close friends in a particular social occasion. So it's very common on all steam folks since most have social anxiety, hence take a long time to make close friends.
There's also a bit of a vicious feedback loop; often people are unwilling to admit that they don't know something because they don't want to appear weak. But until they admit it, they'll always be deficient in that subject.