iPhone XR won't play music through USB after downloading iOS 15?

I just recently downloaded the latest update for my iPhone XR and now my phone doesn't play music in the car. I have a 2012 Chevy Cruze that does not have CarPlay so that isn't an option. I also don't have the ability to connect to bluetooth as I don't have that in my car either. It's slightly older. The only way I'm able to listen to music off my phone is by using a USB charging cable that used to just automatically connect when I plugged my phone in. I've also already tried resetting the bluetooth on my phone, as in turning it on and off few times, and that didn't work either. I hate listening to the radio but I've exhausted all my options I don't know what else to do. My car charges my phone at the same time so I know my USB is not the problem because it still charges my phone it just no longer lets me play music, I'm so sad - help!!!