First of all, your fears aren't irrational. It's a scary world we live in. I live in a "safe neighborhood" but my car was broken into a few weeks ago. Things happen. So no, you're not weird.

As for why you seem to have these feelings more than others, I don't know. But try not to do something that I do all the time. Try not to get stressed about the fact that you're stressed about something. I drive myself crazy doing that.