I used to have the same problem at work, especially during meetings. I’d get nervous just sitting there -- afraid that if I opened my mouth, something stupid would come out. Those are negative cognitions, probably rooted in low self-esteem. I found that if I took a look around the conference room, I could see that I was just as good as the people there. Most of them weren’t any better looking, smarter, or more capable than me. So I would just tell myself, “I’m as good as these people. There’s no reason to be nervous.”

That self-talk helped me quite a bit. I don’t know what your work environment or situation is, but often countering the negative thoughts can help quite a bit.