Hi Dagmatuser1,
For help with your iPhone connecting to your car, know most auto-play or connect options are set by the car manufacturer. "On some vehicle models, CarPlay Home appears automatically when you connect iPhone." You can find this information and more here: Connect iPhone to CarPlay - Apple Support
However, you can disconnect from Bluetooth accessories and your car from Control Center using the steps here: Use Bluetooth and Wi-Fi in Control Center - Apple Support
If you'd like you can also reach out to your car manufacturer for more information on if the auto-play connection can be disabled. Contact a third-party vendor, and check your location service settings with the steps here: About privacy and Location Services in iOS and iPadOS - Apple Support
Cheers.