Nothing to do with self worth, it is a meaningful job, but a fun one?

Clear mission, a well set up team and autonomy in execution can make most jobs fun to do? Stress (due to), lack of autonomy, lack of clear mission and bad teams and management I think are the root of unhappy work?

Not all jobs are fun, but they can be bearable if meaningful enough (whether that being useful for other people, or even just provide a living wage to support your family)