Less confident people are more successful

I liked this article in the HBR.  I am one of those people who consistently questions themselves. Despite being a consistent high achiever, I used to really lack self confidence. But over the years, I learned to trust my judgement and my abilities, and gain a reasonable amount of confidence. But I still avoid "winging it" and like to be prepared, I am still self-critical, and I believe that I rarely seem either arrogant or deluded. Looks like my lack of confidence, which troubled me for some time, was really a helpful trait.