Meh people get this shit all wrong.
For one thing everyone is insecure and that's the way life should be, otherwise your likely quite delusional.
What one has to do is remove the uncertainty and doubt, by not being afraid of the negatives something pseudo confident people cannot do.
I'm quite confident I have intelligence, I'm confident I'm fat, I'm confident I have social impairments, I'm confident I'm gonna die, and I'm also confident that there is little people can do to effect when I die.
Confidences is about being self aware not self esteem. Being able to see how your flaws relate to others in the moment is the best way to be.
Too many people turn on blinders to shit that there bad at.
IF your aware your ugly when asking a chick out the scenario of being rejected isn't really taken personally, because you have confidence that your ugly.
Now if you were afraid to accept that unpleasant reality, every time you ask a chick out that uncertainty is there, and whether or not she says yes you still always have to deal with that. Because your afraid to deal with that uncertainty, your taking on a much larger parcel.