Things I learned about Optimism and pessimism in "Authentic Happiness" (a book I am reading under mild protest for my positive psychology class- I am also taking the class itself under mild protest and scheduling issues- oh hell, it's fun) (also: not quoted verbatim):
Pessimists/depressed people are more accurate in remembering both good and bad events than happy people. Depressed people are more accurate in judging whether or not they are in control of something. A negative mood enables one to identify problems and therefore eliminate them. If you are depressed, it is a good time to take a test, do your income tax, and even pick where to go to college.
However, optimism has its place in thinking. If you need to be creative or generous, you should be in a good mood for that task. If you want to pick a new career, do creative writing, or think about a relationship, do it in a good mood.
Women who geniunely smiled in their high school yearbook picture (as opposed to a fake smile) were more likely later in life to be happy in their marriage and life in general. Attractiveness WAS controlled for. Smiling was the only variable.
Optimists live longer, too. In a group of nuns (all of whom lived the exact same way/ate the exact same things/etc. etc.) the nuns were assessed for positive emotion. 90 percent of the most cheerful quarter was alive at age 85 vs only 34 percent of the least cheerful quarter. 54 percent of the most cheerful quarter was alive at age 94 as opposed to 11 percent of the least cheerful quarter.
My conclusions:
Life sucks, so I'll be glad to die sooner.
((Sorry, I had to mitigate that somehow, I'm still a pessimist))