Music not working through aux

I have a 2013 Infiniti g37x and it dosent have aux it was a usb for the aux and I do not have Bluetooth. It only works when I have Apple Music purchased and I’m tired of paying for Apple Music when I don’t even use it I use YouTube music and all my songs are downloaded and I am on the latest iOS and I have a iPhone 16. Anyone know any work arounds. I already tried buying a song from iTunes and downloading it but that didnt work.