Sounds like you got the fever bad. I don't there is a cure for it either.
A 9MM is a good choice. They are fun to shoot and abit less expensive than 45 ACP. Rght now it may take longer finding ammo than finding a gun. It might be worth looking at 40 S&W gun, at least there's usually some ammo on the shelf somewhere.
Shoot often, have fun and be safe.