I can't.
The reason for me is not too much thinking, it's too much feeling. when I talk with someone, there are sooo many informations and impressions overwhelming me! I can't process them and talk at the same time, so I stutter or get really awkward, like closing my eyes and stopping in the middle of a word for ten seconds till the storm has calmed down.
I almost never make corrections to what I write, but am able to express myself better. When I write I'm alone, no impressions overwhelm me, so I can just let the words flow out of me. That's like switching modes. I love the writing mode
For sure some people think I'm a complete idiot after talking to me. That's funny.