Education and careers...very deep subject which can be approached at a variety of angles. From the primal perspective, one could argue that a formal, institutionalized education nor a career is unnecessary to sustain your existence (or that of others), as one could provide for himself; for instance, a farmer/hunter. From what I perceive, it seems as though careers and formal education ideologically mold people into becoming subservient in the aspect of becoming eligible to working for or under others, as opposed to being independent and self-sustaining. I do not like to be controlled, nor do I take interest in or gratification from controlling others.
I think that if you are not already passionate and self-educated about which career field you would like to pursue, then you wont capitalize on neither enjoy the said career nor the educational journey associated with it. This applies to any career, whether it be an astronaut, plumber, clown, ice sculptor, samurai, potter, fisherman, etc. Unless you are naturally indifferent to misery and hardship (which I think is virtually, humanly improbable), I would say that one of the main objectives of life is to mitigate, if not eliminate stress.