Earlier quoted context omitted.
In a past life I got pretty deep into trying to help guys like this. There's a whole industry around it peddling advice that ranges from effective (yet impossible to implement for a broken person) to counter-productive and evil. It's really very simple, but people just have massive amounts of negative programming that radiates out from them like a reverse pheromone. Those who are hungry do not eat. You can't fake it,…
Might be simple but still unattainable to a huge swath of guys. It's like trying to tell someone not to freak out before a job interview - just go there, be yourself and don't care about the outcome. Let me know how well that worked out...
1. The same strategy applies to public speaking, or product demos, or chairing a meeting, or systems design for people who feel they are not good at it. The human mind is incredibly adaptable and has great capacity for learning when exposed to new environments. The only exception is if the person has some kind of trauma or psychological wall and exposure harms them - in that case, I recommend talking to a professional first.