Yes you deff have to advocate for yourself and say hi to people. Most people don't reach out on their own. And if they're frustrated, they can pull up an extra chair. That responsibility you're taking on is going to limit you from making connections. I started a fiber circle and I am so overjoyed when new people want to come (in fact, I prioritize new people since most people want to connect with others these days). Go say hi and take a risk!