Hi,
I also feel weird AF working with other people I don't know. I would think, if they're posting here, they probably accept the necessary awkwardness of getting to know you. It is kind of scary and that's ok. I found a blog post on itch that was helpful for me. Perhaps it may be of use to you too. Scroll down and see best practices. TLDR: start small, define roles, set goals and respect timezones and each other
https://itch.io/blog/1038830/collaborating-with-other-game-devs-online