I DO TOO!!! I think the problem lies with us feeling "forced" to say those words. So eventhough we clearly know what we want to say, we'll get nervous - like stage fright. I mean noone likes to be forced to do anything, right? I usually try to distract myself, by hitting my thigh repeatedly (like clapping, but between my palm and thigh). 50-50 it works. You can try it.