Knowing your capabilities in execution of task defines self-efficacy. Why it is necessary?
Self-efficacy is necessary, because it measures your self worth. It will help to mold your strengths in doing something at own pace. You are not afraid of showing off your passion, henceforth you enjoy instead.
This behavior matters at work and in your day to days accomplishments. Self-efficacy have been develop by experiences and with proactively learning new challenges.
If challenges come into play, embrace it. In a long run, you will reap all the fruit of you labor.
Sending positive vibes!