Why did you study your career?

In the primary i wanted to be soccer player because i played a lot of football and because i trained in a football club, after when i was in the high school i wanted to be doctor but one day in the class of biology i realized that it was not my vocation, because i and my group had to dissect the parts of a animal, it was an unpleasant experience, after a while i started a interest me in investigation, then i decided study a career related with the sciences like the biology and chemistry, after many years i entered to study biochemistry only with the idea of study sciences, nevertheless in the present i do not know if it is the career of my dreams, because i have analyzed the cons of my career and then i realized that the poor job security it is something that worries me, thus i am thinking change me of career, because my dream is work in a laboratory applying my knowledge but having the security of have a stable work in the future.