Discovered I'm being a paranoid idiot again. One thing they don't tell you about being a pessimist is that when something good does happen, you're either relieved or pleasantly surprised.
I don't envy optimists, I pity them. They must get disappointed quite a bit if they always assume the best is going to happen. I don't assume the worst thing is going to happen, I just try to prepare myself in case something bad does happen.