The only way to build confidence is through experience and they can be either good experiences or horrendous ones.
Personally, it is my experience that the worse the experience, the better the chances of channelling it into making oneself more confident and have higher self esteem.

There is no easy way to build up confidence and anyone who tells you otherwise is a liar or is trying to make money off you in a motivational seminar. Succeeding at a task once will make you believe in yourself and your capabilities more, thus raising your confidence and self esteem.

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