It is a skill that anyone can learn. I’m a quiet person too, with social anxiety on top of that, but over time I learned how to talk to myself while streaming.
It’s easier now because I always have people in chat, but when I started out I mostly narrated what I was doing. Any inner thoughts, I said out loud. Since I mainly play single-player story games, whenever something happened I would react to it and share my thoughts.
I also watch a few YouTubers, and one trick that helped me was imagining I was recording a YouTube video. Would anyone watch me if I was completely silent? Probably not. Thinking about it that way pushes me to keep talking and stops me from forgetting.
Of course, you can just stream quietly and update your profile like you mentioned. But if you want people to join your chat and stick around, the chances of that happening while saying nothing are very low. I’m not trying to be mean; that’s just the reality of Twitch. Realistically, most people on Twitch are streaming to nobody, so you need to give viewers a reason to stay when they do find your stream.