I'm generally optimistic - too optimistic, in fact. I guess that's just me believing that everything will be all right in the end since Allah is there to guide us. I do believe everything happens for a reason; after being eight months out-of-work and my fiance being fired because a manager of another store lied about his customer service skills, I believe optimistically that it happened so that Allah may give him a better job: in this case, 40h/w (in comparison to 28 from before) on night-shifts at Walmart with a great team (in comparison to the crappy team he had before, too).
I only become pessimistic about my weight. Otherwise, I'm too optimistic.