It will probably happen everyone at one time or another. You will sit down and think "Now, how did I get started in this in the first place?" For me, it was as I began to consider the thought that service is one of those things that I really love, but honestly, where does that come from?
The same can be said of other people. What makes some people, like Mother Teresa, so keen on helping and loving others? It might seem that the first and most obvious and correct answer to a question like that is "Duh, Stephanie -- God. He gave Mother Teresa a gift in taking care of his sheep." Hey now, no need to be rude! I'm just kidding. (Mostly.)
While I agree, yes, God gives us gifts and he will bless the work we do for him with those gifts, I think that the way that God makes us (which can also be interepreted as which gifts he gives us) determines us to like certain things. Generally, if you are good at writing, you like it, yes? Yes.
But environment plays a part in that too. If you are around people who tell you that writing is repulsive and you should never, ever do it, what is the likelihood that you will do it? Not so good.
Here's where it makes sense to me: I like service. I have as long as I can remember, but as long as I can remember serving, I have been surrounded by adults who are eager to serve and to serve with generous and joyful attitudes. The two adults who showed me this the most often? Well, they also happen to be my parents and I cannot believe how grateful I am that I had such great influences and support in doing something that I would finally realize I loved. My parents, because of their love for God and the people around them, expected me to love God and the people around me, too. The lifestyle that they created for my brother and I fostered that and now look what we have to show for it.
So today? I'm grateful for opportunities to serve, and parents who had great expectations for me in them.