Source: Am airline pilot.
That is not authoritative on the subject. If you were an aircraft engineer designing cabin fuselage for Boeing, that would be different.
While in pilot training I'm sure you learned a lot of things about air pressure and air flow over the wings, I seriously doubt you are an expert on the exact changes involved for bullet holes in the fuselage. Flight school won't have you spending time memorizing the material properties of the compounds used in the fuselage, won't have you studying the formulas for airflow through tiny holes and the stresses it places on them. Flight school certainly won't have you analyzing assorted styles of bullet-hole punctures to see how it affects metal fatigue and stress.
And as for maintaining pressurization, as a pilot you should already know that ECS compressors are running all the time. Some of the air exits through an outflow valve, but quite a lot is constantly escaping through small leaks all over the fuselage. While the design attempts to build an air-tight fuselage, in practice there are many small holes and air escaping everywhere. Yet the aircraft doesn't explosively decompress from those small holes. "Miraculously" everything from a small Cesna to a jumbo jet remain intact despite the pressure differences and small leaks around the craft.