I cannot install the camera app on my iPhone. Have tried EVERYTHING!

What do you mean you can't install it?

It's part of iOS and can't be deleted.

Check to see if you have restrictions set on the camera.

If you have a corporate Exchange account set up on your phone, the administrators can enforce policies on the device, including completely disabling the camera.

Did you check restrictions like KiltedTim suggested?

Settings > Screentime > Content & Privacy Restrictions > Allowed Apps

If the switch for Camera is turned off, then that would explain why you can't find the camera app

I suggest you make an appointment at the Genius Bar of your local Apple Store.