Unnecessary paperwork
Breaking and/or spilling things when I'm in a hurry
People saying they'll do something and not doing it, and not even warning me that they're not going to be there
People saying "Don't worry" and not following that up with something like, "I'll help you."
People telling me I think too much. Now, who exactly gets to decide how much I think???

And I'm with Homeira. I'm irritated most of all with myself. It's hard to get myself to go to bed on time, eat only as much food as I need, etc. (I'm doing better with things like this since I made a schedule, and I've been following it pretty well... but right now I'm supposed to be cleaning house.)