Is there a way that I can delete this update? I can’t FaceTime anyone and my phone keeps freezing so I can’t really use it.
The iOS 15 update
I guess that answers the question I had of whether I should dive in with my main device.
You will find Apple's instructions here.
https://beta.apple.com/sp/betaprogram/unenroll#ios
With more details here:
https://beta.apple.com/sp/betaprogram/restore?locale=en#ios
Remember that beta are just … beta. With its share of risk. IMHO, you should not install on your main device, but use one that has no critical use or data.