Just upgraded my Mac computer hoping to use Lightroom classic. My new operating system is Venturia 1

By Lightroom Classic, are you refering to the current subscription model, or the older pre subscription, perpetual model, that is v6.14 or older?

Do you mean you upgraded just the macOS system software, or you bought a whole new Mac? What version of Lightroom were you using on your old system?

If you were previously using a Mac or Lightroom that were several years old, your old copy of Lightroom might be too old to work on Ventura or a new Apple Silicon Mac. If so, the fix is to use the current version of Lightroom Classic, which definitely supports Ventura.

I have no idea where you got that impression, but it is totally wrong. Lightroom Classic is fully supported on MacOS Ventura. There are a few known issues, but nothing major.

I'm not a Mac user but as far as I know the latest Lightroom Classic version 12.0.1 support Ventura.

More informations you'll find here: Lightroom Classic and Ventura | macOS 13 (adobe.com)

Which Lightroom version do you use?