Egoism:

Egoism is a philosophical concept concerned with the role of the self (or ego) in motivating human action. Broadly, it refers to the view that self-interest — or action guided by one’s own will — is a central or ultimate driver of behavior. Egoism is commonly distinguished into descriptive forms, which claim that people in fact act primarily in their own interest, and normative forms, which argue that they ought to do so. While egoism can describe extreme self-centeredness or prioritizing one’s own needs, it does not necessarily involve grandiosity or boasting and is most often used to name an ethical or motivational framework rather than a personality trait.