Are you pessimistic or optimistic? Why?

If i'm pessimistic or optimistic, it depends. I think i'm fairly optimistic. I try to have a smile on my face and see the good in things. But, i find when i'm tired, i tend to be more pessimistic. I think too, i can be kinda a perfectionist sometimes. I get stressed out, and so i'm hard on myself and negative. I would like to be more optimistic. I've tried to be more of a positive person and see the good things, but sometimes it's easy to start looking at bad things and become critical. Ohhh.. maybe i am more pessimistic. I don't want to be, so i will have to work on that.