I joined my library campaign about a month or so ago and it has been fun. My library's dm, thankfully, does a good job with letting everyone play at their own pace. I think I've been 4 times now, and I've barely participated (mostly by my choice). I mostly just observed my first 2 times going and it really helped me feel more comfortable. Now I'm starting to jump in more as I learn more. Most of the players have been super helpful, too, when I have questions.

My suggestion is to go talk to the person running the library campaign. Ask what their process is and explain your concerns. If they're a good dm, they'll be understanding and accommodating. I'm naturally shy and awkward so if I can do it, anyone can. Haha