Self-confidence is a feeling of trust or confidence in one's own abilities, qualities, skills, intellect, brain, strenght, character and stuffs like that. Now listen up, you should be self-confident. But, never become overconfident i.e. never become excessively confident. For, your ability, quality, skill, intellect, brain, strenght or a stuff like that can fail or disappoint you even when you least expect it or rather when you need it most.
Emeasoba George