Not at all. Those pieces of glass, wherever they are, are nothing more than a mirror without the silver reflective surface behind them. I use reflections all the time to be aware of my surroundings. It is just another way to stay in tune with what is going on around you without having to have your head on a swivel as much.Am I at least a little bit over the top by checking the reflection in the glass every time I walk up to the drink coolers in a store?
As for the listener thinking you were paranoid or scared, they are probably of the mindset that anyone who opts to carry a firearm is paranoid and scared. They will also be that person who gets attacked and then when asked later will swear that the attacker just materialized out of nowhere.