Why is it that the more I have to do, the less I feel like doing it, and even though I know deadlines are looming, both short-ish and medium-term, I don't seem to manage to plan my time in any kind of structured or effective way. I know all the things I have to do will take way longer to do than I have time to do them. Most of them are also things I hate.

Don't you hate it when you answer your own question.