I think my problem is that the "worst case scenario"- while nothing to the average person- can be devastating to me.
So, say I go out and I look not-my-best. Some random stranger makes a negative comment about me to another random stranger. I will most likely never see them again.. But I will NEVER FORGET the comment that was made. Anytime I'm getting ready to go out, I will hear their words echo in my head.
Even when I fight with some random person on the internet about things that don't matter at all (like some noob ninja looting something without realizing that it's bad form), I will get all shaky and will obsess over it for days.
Worrytown- population: me