For some reason I freak out when complete strangers stand behind me or too close and out of my field of vision. It make's standing in lines a nightmare for me and even worse if someone touches me or even accidently bumps into me. I prefer being alone or with people I know extremely well and in a crowded room (like a concert or resturaunt) I'm usualy in a corner where I know no one can move anywhere close to me without me knowing. Am I too paranoid about people I don't know?
When you start to feel this way, get closer to friends/significant other if they're there, and if they aren't it'd be best to leave the area. This applies anywhere you live, because sometimes knowing the fear is irrational doesn't help. And continually putting yourself in that position of high anxiety is not good.