man, the only people who will notice a concealed gun are people who are specifically looking for one, and if you know anything about dressing around a gun, I guarantee you can carry every day for a decade without anybody ever noticing anything out of the ordinary.
With proper gear it is very, very easy to conceal a pistol and most people are not running around tracking who has a 3/4" bulge at their appendix or kidney. It's a fold of the shirt, or a phone, or it's not getting noticed at all.
Ask anyone who carries...at first, you feel obvious. After a week, you think you're blending in. After a year, you know that nobody's looking. Try it at the range if you're there for a multi-day event. You will quickly realize that nobody can tell, because you will realize that if you're doing it, it's entirely possible that other people are too, and you have no idea who.