When do i stop talking?

There are moments when being uncomfortable makes us talk more: about the weather, about the cat left alone in the appartment... about things that usualy would not get so much of our attention. It happened to me recently in a conversation with a man when I tried to say something but my words came out wrong. I was so terrified that he might get the wrong idea that I started explaining what I meant but again, nothing went right. And so I was digging deeper into the problem, mumbling things that made no sense, when all i had to do is stop talking in the first place. I guess being affraid of being missuderstood makes us talk more and insist on issues but all we have to do is take a deep breath and before we continue talking we should see what the other person got from what we just said. Who knows, maybe we are wrong and they got it right from the first time.