Yeah, this...
No. You should run out and buy a 1911 pistol in .45ACP.
I inherited my dad's S&W Mod 10, 4" HB Nickel revolver. I love this gun and shoot it regularly. I have no qualms carrying a revolver; carried one for duty with D.O.C. and also my EDC after I left. The first semi-auto I EVER felt comfortable enough to carry was a S&W 39-2 in 9mm. First semi-auto I ever trusted my life to.
I own a Ruger P89DC in 9mm. I shoot it and am comfortable with it; it's a great gun, IMO.

This gun shoots anything you put through it, reliable and accurate for SD.
My next purchase was a new Ruger SR1911. Yes, 45acp. Best decision for me, I've always loved the 1911/45acp combination. This is one of, if not THE most accurate handgun I've owned; and I've owned several!
This is my SD/EDC gun-period. There is no "magic caliber", shot placement-hitting your target when it has to be done; that's what it's about. My SR1911 holds 8 + 1; that's half what the 9mm holds. Under gunned? Not in my opinion. I've never been a "compact gun" kind of guy; in the right holster/clothing, you can't tell that I'm even carrying.
No matter what your decision, 9mm, 40, 45, etc, be comfortable with the weapon, become proficient/accurate with the weapon and be confident in the weapon and your ability to use the weapon when needed. Stay safe and keep shooting
