I'm sure you'll enjoy your cruise. We are definitely a welcoming group. Many of us have friends and family joining for different segments. As aliaschief has mentioned, we have met many segment passengers who are having a fabulous time.
We were on the 2018 World Journey for 2 segments and we never felt it was "them" and "us". It was our first Azamara experience and we loved it.
Don't worry, it will be a great cruise.