Hey there brooklynn_mh,
We understand you've noticed the Camera app opens by itself. We'd be happy to provide information to help you troubleshoot this.
Start out by restarting your iPhone to see if this behavior continues: Restart your iPhone - Apple Support
If it persists after restarting, you may want to remove any screen protectors or cases since this may be causing accidental touches: If the screen isn't working on your iPhone or iPad - Apple Support
If your screen is too sensitive or responds intermittently to touch
1. Restart your iPhone or iPad.
2. Make sure that your screen is clean and free of any debris or water.
3. Disconnect any Lightning or USB-C accessories. If your screen works after removing an accessory, try using a different outlet, cable, or charger.
4. Remove any cases or screen protectors.
Kind regards.