A few things to think about.
How did. you hit the rock? Was it a full on strike that caused the boat to shudder, stop and make a lot of noise? Or did you you bounce across the top of the rock? The first might have caused major damage, the second probably not.
Is the keel encapsulated or is it a lead or iron keel?
If the keel is encapsulated, then water ingress is a big deal. Encapsulated keels are often iron or some combination iron and cement or resin. If water can get into the keel then the iron will rust and expand causing more damage that may not be immediately visible. The boat needs to be hauled and the keel carefully inspected and repaired.
If the keel is external and made of iron or the potential for serious structural damage is pretty high, especially in a full on strike. The keel acts as a big lever and forces the aft end of the keel up into the hull. This can cause the area aft of the keel sump to delaminate and the furniture and other structural members in the interior to crack or separate from the hull. The forward end of the keel pulls the laminate down and cause the glass to delaminate, although will less damage to interior structures.
Probably the best course of action is to call your insurance company if you have hull insurance and inform them. Then the boat will need to be hauled and carefully inspected by a qualified surveyor who can determine the extent of damage. If you don't have hull insurance, the cost of a haul out and survey will on your dime, but keeping the boat and you safe is probably worth the dime.