There are days when I say I should do this or that and I just get depressed. I have this theory that if you say, "I should do that," it means you are not gonna do it. This communication style nudges me into a passive place. I also use this method when I need to beat myself up -- keeping me in a guilt cycle.
I have decided not to use that word while communication with myself. Luckily, I have a lick of sense and already learned not to use it with others :-)