HOW SERIOUS SHOULD ONE TAKE A JOB?

I’m confused on how to balance a job.

Meaning I don’t know how serious to take a job without causing harm to myself.

Should I take a job so seriously as like life or death and my whole life depends on it.

Should I integrate my job into my identity.

Is my job my life , meaning and purpose. Is my job me lol am I the job ? I saw a coworker of mine taking her job so seriously that she believes people should make no mistakes. And she always says wants good people

On her team only. Because it represents her

Genuine advice please ?