Holy sh*t, av8orntexas! While managing a store I was robbed by a guy claiming to have a gun. I stayed calm and calmed him when he freaked out over the noise the cash register was making when he hit a button on it while reaching over to get the cash. He only got $50, as I constantly made drops in the safe, and he was caught within a few hours. Not such a big deal, but that was almost a quarter of a century ago, and I've never worked in a similar job since then!
No, you're not paranoid...you're prepared. Good for you!