Few people know so early or so certainly what they want to work on. But talking to my father reminded me of a heuristic the rest of us can use. If something that seems like work to other people doesn’t seem like work to you, that’s something you’re well suited for. For example, a lot of programmers I know, including me, actually like debugging. It’s not something people tend to volunteer; one likes it the way one likes popping zits. But you may have to like debugging to like programming, considering the degree to which programming consists of it.
I did not know what I really want and love till Cong taught me programming. Solving problems and making things work is fun. It’s never seems like work and I love it.