Here's a fundamental question for you: are you an optimist or a pessimist? Does it matter either way?

I've been thinking a lot about the idea of optimism and pessimism lately. Are optimistic people happier or are they more delusional? Are they better at lying to themselves? Are pessimists mostly miserable or are they just realists?

Personally, I'm a HUGE pessimist. My brain always immediately goes to the worst possible outcome of anything. I noticed I have more freckles recently. My brain instantly goes "probably skin cancer". I have a throbbing headache. My brain helpfully suggests "brain tumor". My boss calls me into his office for something? "Probably getting fired" I instantly think.

I'm trying hard to be less of a pessimist but it's basically impossible. I mean, just the other day, I came home and I smelled cookies. Instead of my brain freaking out over the idea of freshly baked sugary goodness, I thought "shit, isn't randomly smelling things a sign you're having a stroke?" WHY, BRAIN, WHY?

So are you a pessimist or an optimist? Any reformed pessimists out there?