If we recall the narrative regarding Stand Your Ground in the wake of the George Zimmerman case, we can observe that both sides of the media incorrectly said that Stand Your Ground means that you can use deadly force in self-defense, without a duty to retreat, if you "feel" threatened.
That's not even close to true.
If you could use deadly force if you "feel" threatened, then Hillary Clinton could murder any black dude in a hoodie because she found him to be scary.
The reality is that you have to have a reasonable perception of a imminent deadly force threat.
Now, you don't have to be right. You don't have to have perfect knowledge.
With a lot of guns, there's no way to know whether or not they're loaded without going through standard procedures in checking. There have been cases in which a person used deadly force in self-defense only to find that the person committing the assault was doing so with a replica gun or an unloaded gun.
In general, if someone is pointing a gun at you, it's not your responsibility to check and make sure that the gun is loaded before you respond as if it's loaded. We're supposed to understand that a gun being pointed at you gives you a reasonable perception of a deadly threat.
Still, it's not about how you feel.
The other day, I walked by a dude who was wearing one of those stupid masks that are basically like ski masks with lighter material. It was a 117 degrees outside. The guy was presenting himself as a thug. Still, if I shot him, I'd rightfully go to prison.
It's not about what you feel. It's about what you reasonably believe.