Is anyone else here shy or does anyone here have social anxiety? If you do, I would like to know: How can I be confident in myself to say "the right thing"? I'm afraid of saying the wrong thing at the wrong time and regretting it!

Essentially, here's the dilemma:
I had a meeting with my boss yesterday to review my performance over the last 90 days. It went well for the most part, except he commented that I don't talk very much during meetings.

I'm actually a very shy person because of my social anxiety. To be succinct, I'm paranoid of saying something stupid that I'll regret (and this paranoia stems from some negative experiences I've had in the past, so I think it's somewhat justified).

The other problem is that people on my team like to talk for the sake of talking and I really don't want to engage in that aimless activity. It's a total waste of my time and I don't even enjoy doing it, so why do it? That's my logic. But of course since he's my boss, I can't just say "well, our meetings are fruitless and I don't want to engage in an aimless conversation". (He doesn't run any of our meetings or participate in them. Instead, he oversees a lot of projects and acts as a liaison between different teams within the company. But still... People on my team are his eyes and ears, and they like to b#tch.)

I have set up my own meetings and run them myself, and they are usually successful for the most part because I'm the one "in control". That's the key. The only time they're not successful is when other people arrogantly override me and start the aimless talking -- but that's not my fault!