I sulked/sulk a hell of a whole lot when I would start to think that I wasn't "good enough" compared to the others around me. In high school, it was other students, and in college, it was any figment of my imagination that I could conceivably construct as a better girlfriend for my boyfriend, lol. /lame girl problems
I would always put whoever it was on a pedestal and mourn the fact that I'd never be as good as them, hate myself a little, then experience a tranquil state of acceptance, and a resolve to make sure I did the best that I could as the miserable human being that I was. Often times, these periods of strife were accompanied by the deadline of a class project or major paper that I had yet to do. After thinking about it some time, and taking into consideration the times when it occurred, I realized it was a combination of stress and procrastination.
I remained a notorious underachiever in high school, however.
Lazy INTP problems.