Is it possible to see only the pictures I've taken on my iPhone?
I made a workflow that filters all your photos from your camera roll. It gets all your photos, excluding an album(select album your chat photos are stored) and also screenshots(you can disable it if you want).

The workflow will ask you if you want to save it all in a new album or in an existing one. You will need to run it each time to update the album.

You will need the Workflow app to run this.