There's no concrete evidence, currently, to suggest that ghosts are real. Or, if they *are*, they may well be "glitches in the system"; instances of something from another, parallel dimension "leaking" into ours. Therefore, you've no reason to be paranoid.
Thanks, I believe that would work if I did believe in science and "if you haven't seen it it's not real" but I don't like science and I like to believe in things we can't see, like fairies and forest spirits rather than... What we can "prove" is real or not.
I'm not even saying that *I* strictly subscribe to that sort-of "if you haven't seen it" thinking. Besides: Believing in other dimensions isn't wholly embraced by science and scientists. It's the difference between taking a leap of faith in a direction that either hurts you or helps you.