All Activity Begins With Desire?

I would have to disagree with Hume, to some extent, on the matter of all activity beginning with desire. When I have a paper or test, I doubt I begin either with desire. I do them because I have to. It is not my passion to write papers because I am not a good writer and hate doing stuff I am not interested in. I have no desire to complete the activity for fun or even for a grade. Wouldn't this contradict what Hume believes activity begins with? Half the things I am doing right now I don't desire to do, but I do them anyway because it will benefit my future. There is only to some extent that activity begins with desire.