Am I eligible for GTIN exemption? (Product ID

Hello! I have a question about how to sell my products on amazon. I have recently been approved to sell on amazon.

I have n Etsy shop (www.ananda-energy.com) and I make homemade bracelets. I am realizing that I do not have a GTIN (Product ID) to be able to list my products on amazon.

Am I eligible for GTIN exemption? and if so, do I need to register my brand through amazon? That is what I am reading online but I am not sure what my “registration or serial number” is. How do I get this number?

Thanks in advance!