His parents have always pressured him into getting a successful career, and so in school he focused all his time and effort into getting good grade, rather than developing interests and making plans for the future. The result is that he doesn’t know what he wants to do in life, what job would fit him. He just knows he doesn’t want to be a cashier. He feels so ashamed every time the subject of jobs is brought up, especially at family gatherings and with his parents around.
Edit: Aww that’s cute