Wanting to say something but no words come out

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Enough times I find myself in a position where I want to say something but no words come out. And that is bad. I want to be able to say anything without hesitating, or being scared, or feeling nervous, or starting to sweat. I want the words to come out easily without any issues. If I can figure out how to stop this from happening, things would be much easier for me. I'd be a lot more social and I'd accomplish a lot more in my life... Has that ever happened to you? How do you deal with it?