Yes. Whenever I find myself in a large group and some of my good friends are with me, they look at me funny because my face goes blank and I stop interacting and they're like, "What happened to her?" The difference is drastic.
In college, I think I spoke a total of maybe four times a semester and classes were small, even--comparatively--25 at the most. And that was a struggle. I always enjoyed listening and being silent really helped me to focus on absorbing, concentrating and analyzing. Whenever I would struggle to speak, I'd waste the whole class wrapped up in my own anxiety. But the pressure was intense because without grades or exams, class participation was everything. My professors would only find out that I was doing fine in the class from my papers, commenting that they wished I would contribute more in class.
In language classes, however, there were usually only about four people and I could talk (even in another language) for hours if no one interrupted me.