I had a bunch of itunes music from 2005 - 2015 or so, I cannot figure out how to find it or play it for free.

Help, I have massive music which I paid for with good money from itunes when it first came out. I really did not think I would ever have to pay to play it through a paid app (apple music). Now I just got an iphone after many years. I would like to listen to this music again. However it seems that I have to pay monthly to access this? Where is the button to please just get all my money back for the the stuff I already bought? How do I access my library for free without subscribing for a fee? Where was it written that I was just renting this music until you decided to upgrade to charge me again?