Does waiting another 5 minutes really matter that much? It could be worse, I suppose, maybe there could be no elevator and you'd need to climb the stairs. Maybe there could be a line to the stairs.

Maybe this isn't a symptom of depression per se, but such anger seems to be to be a factor of discontent that still may benefit from therapy or self-help.

I have no reason to disbelieve you when you say that you’re not depressed, but depression is not the same thing as sadness or the absence of happiness. You can be happy and depressed at the same time.

Maybe you should take the stairs.

It sounds like you folks really want me to be depressed. :-) I can say, having been raised by a psychoanalyst, that I certainly have issues, but depression just isn't one of them.