I forgot my passcode to my iPhone 13 Pro and I need help finding out what my passcode is.

You can't. If you forgot your passcode, you will need to reset your phone.

How to reset your passcode without a computer if you have iOS 15.2 or higher.

How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support

How to reset your passcode using a computer.

If you forgot your iPhone passcode - Apple Support

None of us know your Passcode. You will need to restore the device using a computer. The process will erase the device. Later you can restore your data from a recent back-up. Instructions here…

If you forgot your iPhone passcode - Apple Support

Start here: If you forgot your iPhone passcode - Apple Support