You might be right. I don't want to be some know it all. I am only coming at this from my own personal perspective. And from my own personal perspective, trust me... not all guys are like you read about.
I am an extremely confident person. I could walk right up to the President of the United States and wouldn't even be short of things to talk about. I give a lot of public speaking events, and never even get butterflys. I have played the guitar in the same band for 17 years, and when we go on tour to support a new record, I don't even have the slightest hick-up of nerves.
But if you ask me to call a 21 year old waitress that I am trying to just ask out on a date... I turn into a weak-hearted pussy-hole. Sure I ACT confident around her. But inside, I would just give ANYTHING for her to make the first move.
So yes, sometimes men that parade around the office like they are the most confident thing on Earth, are inside dying for that special someone to just talk to them first.