You can do only one thing at a time. I often feel I should be doing more than I am doing and end up trying to do everything at once. I obviously can't do everything at once, but I end up thinking about everything at the same time. It feels like too much of a luxury to allow myself to think about only one thing at a time. I have this irrational belief that I can only get everything done if I think about everything at once. Pretty silly, huh, because I end up getting absolutely none of my tasks done. I only succeed in getting myself incredibly worked up and adding to the normal stress of school and all my other obligations.