Why do some people never find their dream job?

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I was talking to a fellow coworker the other day at the grocery store I work at. I asked her what her dream job was and she responded: ”I don’t have one”. I said so are you just gonna work at this grocery store your entire life? She said well I earn $17 an hour so why not. And she is in her early twenties, it just makes me wonder with only one life to live why not try and at least find your dream job. Even to know what it could be would be great.