This may become one of our skillful habits, not often found in the world. An important aspect of the Buddha's teaching is the combination of clear comprehension with mindfulness. The Buddha often recommends them as the way out of all sorrow, and we need to practice them in our small every-day efforts. These may consist of learning something new, a Dhamma sentence remembered, one line of chanting memorized, one new insight about oneself, one aspect of reality realized. Such a mind gains strength and self-confidence.
Renunciation is the greatest help in gaining self-confidence.
One knows one can get along without practically everything, for instance food, for quite some time. Once the Buddha went to a village where nobody had any faith in him. He received no alms-food at all, nobody in the village paid any attention to him. He went to the outskirts and sat down on a bit of straw and meditated. I'm very sorry.