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Personality is partly genetic, but it's also influenced by environmental factors:

Genetics
Twin and adoption studies estimate that genetics account for 30–60% of personality. Many common gene variations, or polymorphisms, combine to influence personality traits. For example, variants in the DRD2 and DRD4 genes are linked to a desire for new experiences, while variants in the KATNAL2 gene are associated with self-discipline.

Environment
Environmental factors also play a role in personality development. Experiences shape how people behave, interact socially, and respond to their environment.

The relationship between genetics and environment is complex. While almost everyone agrees that both genetics and environment are important, there's disagreement about which is the dominant influence.