Self-perception is a core component of our identity. When we achieve something like a degree, promotion, or other accomplishments, our confidence and perception of ourselves are boosted.
Individuals with positive self-perception are grounded in the (unconscious) belief that they are worthy, have value, and are intelligent and competent. People with negative perceptions of themselves tend to believe they are worthless, invaluable, and incompetent. Their self-talk is defeating, their self-esteem is diminished, and they see the world as more negative.