When I try to open LR it says the catalogs are corrupt and cannot be repaired. Should I delete it from my Mac and reinstall?
Reinstall will not fix a corrupt catalog.
You need to find a recent backup of your catalog file, which hopefull is not corrupted, and then open that.
Corrupt catalogs are often a sign of a failing hard disk, you would be wise to run diagnostics on your hard disk.
Retrieving data ...