How can I get off of the beta 14 and keep everything on my phone

Hi zanyra,

Welcome to the Apple Support Community. I do apologize for the inconvience that you are having with your iOS 14 Beta. If you are having an issue with your iPhone, you can report it to Feedback Assistant which is in your App Library or your screen. It is recommended that you do a backup with iCloud or iTunes (Finder in Catlina). After you back up the device, it is recommended that you Restore the device and create a clean install of iOS 13.5.1. If iTunes/Finder gives you an issue while restoring, you can also try using Apple Configurator 2 Beta. This worked when I had an issue with my XR. After that, when you go though setup, you can select Restore from iCloud or Restore from iTunes/Finder. In this post I am including a links to Apple Support articles which might help you out.

Backing up your Device

How to back up your iPhone, iPad, and iPod touch - Apple Support

Recovery Mode

If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support

How to restore from backup

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Best of Luck

-Apple_Tekh

Use the archived backup you made when you updated to the Public Beta as specified in the instructions when you join the Public Beta. How to uninstall iOS beta software - Apple Support

They have already installed iOS 14. If they did not create a backup prior to installing it is too late to do so now as it will be an iOS 14 backup, it will not install on an iPhone running iOS 13.6 (which is what they will have to roll back to).