I never knew what I wanted to do for a living until my senior year of college, when I took a course on memoir writing.
That was the first class I took that was focused purely on writing. A professor named Elizabeth Stone, who was faculty adviser to the school newspaper, taught us how to write short essays about our own lives. I was incredibly shy in college but realized I could open up through my writing. The class also taught me how much I love storytelling in all its forms.
Stone reached out to me and encouraged me to join the student newspaper. She also helped me realize I could pursue journalism even though I'd majored in psychology. Eventually, she wrote one of the recommendations that helped me get into Columbia's j-school.
If I hadn't taken that class, I think there's a decent chance I would have "fallen" into another profession that made me far less happy.