I think calling this 'paranoid' is a bit misleading. Paranoia suggests you are deluded or irrational, and that nobody's out to get you. In reality, people might be out to get you, just like walking a city street, someone might be looking to mug you. The difference is, they aren't looking for you specifically, the chances are pretty low of you running into them, and you shouldn't be overly worried or take too many precautions just because of that possibility. But you should be informed, and let your awareness of the possibility inform your actions.