How do I decide whether to pursue postsecondary education if nothing interests me?

well I guess you work backward

first decide what you want as a job then decide what kind of requirements are needed for such job

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So for example: If I want to be a cashier, do I decide what kind of requirements are needed for being a cashier?

nothing a high school education should suffice but being a cashier seems a bit low in the grand scheme of things to be ambitious about

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Then how do I work forward from cashier to something else?

well if you like dealing with people then customer service?

HR?

human resource management?

if it's the money then accounting maybe?