I was depressed, then i found the Escapist, now everything is better.
In all seriousness I usually have an upbeat attitude, but there was a period of time halfway through high school where I periodically would get sick of all the BS in my life and become extremely antisocial and easily annoyed, that went on and off for the better part of Sophomore and Junior year. Then I realized that everyone had to put up with the same BS or were worse off than me, so I finally got over it.
Still kinda antisocial though, it doesn't bother me to much.