I do that, not so much now, i stil have to say "i dont know" Just so i stop thinking it, then i say what i was thinking. It is really hard, but it beat beating yourself up for not saying stuff when you have left.

I think the reasons i did was control and trust, i spent time thinking about what i was going to say so it didnt sound stupid or that it wasnt a waste of time. I had a smiliar moment when i thought that it was stupid and tried after that not to do it agian

Hope my ramblings are of some help

Lucy