The way to improve our internal level of confidence is to eliminate limiting beliefs. Every negative belief we have lowers our confidence.
Morty Lefkoe notes, "It is important to distinguish between confidence about being able to perform a specific task (such as fly a plane or speak a foreign language) and confidence in yourself. One might not be confident about being able to perform a specific task even though they have high level of self-confidence. Such a person knows that her inability to perform a specific task means nothing about her as a person."