When my son was 8, he asked for the definition of the word potential. I explained it meant to have the capacity to improve. I asked him if he had potential. He said no. I explained it again. He said, "No I understand what it means, it just doesn't get any better than this!" Most of the women I talk to don't have my son's overconfidence, which is a shame, because self-doubt can sabotage your career. The best antidote to self-doubt is having a group of peer mentors who can be your cheerleader but also hold you accountable for your ambition.