Are the tales true about a dream career?

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Well, I'm gonna start my senior year in high school, and I'm still having problems about the career I wanna study, although last year I took this aptitude test to see to which career I'm most "inclinated" to, but it still leaves me certain doubts about my future. So I want to know if your studying a career; is it your dream career? How did you knew it was the best career for you? Are you happy with your choice or would you like to retract? Did someone influenced you to study that career?