I don't know man, I've just always been a pessimist. I found it easier that way. When you expect the worst there's no room for disappointment. It's not like anything will, you already expected it if not worse. If you're optimistic, there's room for letdowns, disappointments. Even if I'm pessimistic, I still cherish moments with loved ones and all. It gives me more of a reason to spend more time with them. What's so bad about being a pessimist?