Isn't it ironic to feel insecure about what other people think of you, when another person exhibits that they are insecure it is repulsive? At least to me. Perhaps the worst form of insecurity is when people think that you dislike them. It puts the burden of their insecurity on you, and to me that is obnoxious. Think about the insecure, down to the most primal level they do not fulfill the basic need for confidence to attract a mate for the intrinsic drive to sex.
The thought came to me when I was thinking about myself singing Karaoke at a block party. My singing is not bad, but I always sing an octave too high when I can't hear myself sing! Good fucking lord every time I think about it makes me double over as though I just got punched in the chest. Yet that insecurity makes me less respectable, it is a paradox. No one who was there really would really want to know about that.
Yet there is a balance, because the inverse of insecure is lack of self awareness. Could insecurity perhaps be another form of lacking self awareness? It is good to be leery of the qualities you exude, because all actions are political down to the shoes you wear and the inflection of your voice. But anxiety is a disease of the imagination; you could never know how other people see yourself in their eyes. So you have to simultaneously be aware of the way you present yourself and be unconcerned with your own shortcomings.
Think about what a shortcoming is. When you fail to do something, no one ever wants to hear your excuse. People want to hear that you tried, people like to hear about overcoming the greatest adversities. We all are still mentally in the coliseum of Rome watching the gladiator get mauled to death or triumph victoriously. Insecurity is for the weak, it is for those who are literally not worth a single fuck.