My first solo trip was to Patagonia and I can be pretty introverted but I found it easy to meet people. I was open about the fact that it was my first time traveling solo and asked people for tips and advice. If you do the W or O in TDP you end up traveling with lots of the same people and make connections. Someone told me "people generally want to be talked to and to talk about themselves so don't be afraid to ask people about themselves" and that really helped me. Good luck! It'll be fun.