DanDeFool said:
It's basically a dipstick for successfulness.
Is it?
Let's look at Donald Trump. Anyone who has to get fake tanned to that shade of orange and who can't let themselves go bald gracefully clearly has insecurities, which are also pointed out by his absurd behavior and constant attention-seeking. And yet, he's the very definition of success. I'm sure a cursory examination of the celebrities in any country would bring out a whole laundry list of people who are successful yet lack confidence.
I had a classmate in high school who was the epitome of high school success. Popular, funny, extroverted, athletic... he appeared to have it all. He had friends, he had charm that could let him get away with anything from most teachers, he had women, he had money...
...Until he killed himself.
People wear masks. Confident people are no exception. Everyone has doubts. If you do not doubt yourself, you have a psychological condition called narcissism. You should seek help.