We seem to understand the concept of volunteering differently. To me, whether you are social beyond what's required to help out has absolutely nothing to do with the spirit of volunteering - it's nice if you enjoy it, of course, but if you don't it doesn't mean that your volunteering has less value or worth. Volunteering means helping out for free, and if only the people who enjoy being around others were welcome to help out at events for free, a lot of solitary-type work would not be done, or would be done only grudgingly.

In any case, Yobeth, I would bring it up with T, simply because this is an issue that affects both your life outside therapy, and your therapy itself.