Confidence is freedom from doubt. It is belief in yourself. It is belief in your ability to manage unpleasant surprises. It aids you in overcoming fear, and in engaging tough trials under stress and pressure. Confidence in others is based on your trust in their fidelity and abilities. Your trust may be supported by history, or demanded by the necessity of their presence alone.
Self-confidence is naturally suppressed by feelings of inadequacy, or fear of failure, injury, or death. Condition yourself by repetition of mild, yet ever-intensifying versions of a challenge. Familiarity will build confidence through your expectation of positive outcomes. You will gain the self-awareness of your mental, moral, and physical strength to do the right thing, in the right way, for the right reasons.