Self-affirmation plays a crucial role in mitigating friendship insecurities by boosting self-esteem and confidence. When individuals affirm positive qualities about themselves, they are less likely to internalize doubts about their friendships. By acknowledging their worth and value independently of external validation from friends, individuals can develop a more secure sense of self-worth. Self-affirmation acts as a protective factor against negative thoughts and helps individuals navigate uncertainties in relationships with greater resilience.