Knitting

I want to knit a sweater. Unfortunately, I'm in the middle of knitting a scarf. I will not start another new project before I finish this one. Today I had three unfinished projects going, including a knitting project (the aforementioned scarf), a crochet project, and a drawing project. I did finish my drawing project, as that is supposed to be the focus of my efforts these days. Once it's sealed I will take some pictures and post it on my Etsy shop. And, for the second day in a row, I drew in my sketch journal! I'm being very disciplined. Perhaps when I'm finished with my scarf, I will no longer feel like knitting a sweater. Why is it, that when a task is no longer optional, it is also no longer as fun?