If you dont carry all the time, Id suggest you start trying to do so as much as you possibly can, even if its just around the house, to the point that it becomes a natural thing to you and you dont even give it a thought. The more you do it, the easier it gets.
If you act off sketchy, like maybe youre carrying a gun, or like you might be up to something, people will pick up on that, assuming their heads arent buried in their phones and are even paying attention. But things like that will tend to draw attention. If you act naturally/normally, even wearing 3 guns, 4 knives, and a couple of saps, they wont pay you any mind.
You also have to get over what you think other people think, "rules" that have no force, etc, and stop worrying about things like that. Just go about your day as if it was any other day, simply, because it is.
A lot of how you carry a gun has nothing to do with the gun or how you carry it, its how you carry yourself while you are carrying it.