One of the comments people say to me is "you seem so confident." And I've heard other people remark about other women, "She has a confidence about her, that's what makes her successful." As women, we hear this a lot and it's true. You do need a certain amount of confidence in order to gain success.
As women, confidence seems more like a luxury item rather than a standard. It's something that is only for the "chosen" and not for the rest of the people. But that's mostly due to our conditioning from our environment. It's not something you are just born with necessarily, but is learned. Many of us have learned to stifle our greatness or make ourselves shrink to be smaller. Because of that we are not taught how to be confident.