When I open Lightroom Classic, I get a screen that says" Adobe Photoshop Lightroom Classic - Select Catalog" but I don't wanna select a catalog. All I wanna do it go to the Lightroom homepage .

The Lightroom Classic “Home page” as you call it is the catalog. Lightroom Classic cannot run without a catalog. If Lightroom keeps asking for it, then that may be set in Preferences - General.

Hi, ​@georgef34613995, is this your first time with LR Classic? If not, when you see this message, do you see more than one catalog to open? Can you please take a screenshot of what you’re looking at, that will help us. 

Meanwhile, Lightroom Classic works within a Catalog. It stores where each of your images are and what has been done with them for enhancment, etc. 

To better help you, what is your OS and what release? What version of LRC are you using and what release?

Sorry for no immediate answer, but once we get this worked out, it will be completely obvious.