I was in the same boat. Honestly I think smiling and other gestures of acknowledgment go a long way when speaking is too much. For attendance I’ll sometimes raise my hand instead of giving a verbal response if permitted. Isolating is very tempting but even when I felt the most alone I still tried to go out and be part of social events even if it didn’t go the way I wanted it to, it’s so worth it in the end to at least be able to say that you showed up. Uni is a great time and you deserve to be able to experience as much as you can! Another idea would be to confide in an advisor to discuss options. Find what works for you and stick with it 😊