To my mind, sales people were slick, oily and unpleasant. They traveled with an overnight bag filled with Hermès ties and carried a slight odor of sulfur. These days, I can give you thousand reasons why I love sales people, and why you should too.
To attend to your self doubt requires moving towards it, resisting the temptation to push it away. There is a natural tendency to turn away from negative feelings, similar to what happens when we touch a hot stove.