I need help with my iTunes account. Is not working

The problem is that already have an ID account. I create it when I was in my native country. Actually I live in United state so I bought an iPhone. I wanna buy something on YouTube but I can’t because my “itunes” account is in my native country and I need to change my region to buy it. Ok, i did it. I change the region and the country and they said that I can’t buy it because my itunes was in my native country. Not in United state. I change my region to United state, I did everything and I still can’t do it. I don’t wanna changue my Apple ID because I’m gonna lost my information. Plis can someone help me?