In my case, that "Natural-Born scientist" is not true at all. I was never interested in science. And in school, If I had even the litlest interest, it was gone.
Science classes were boring, slow and they gave us way too many subjects at once, so I couldn't keep track with everything and what all the elements and their names were.
Then I just quit. I paid no longer any attention in the classes. Somehow I passed but in that day, I knew I would never like science related stuff, because it left a bad taste in my mouth.