Somehow I not only don't realize how uncomprehendingly fast I speak sometimes, but also don't hear the vast difference between the perceived sound of my voice and reality. I used to think it has to do with not hearing my own voice well, so I don't have sufficient feedback. It may be true to some extent though. Practicing by speaking into a mike and listen to it in headphones may help, I was just always too anxious to try it out.
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Another non-English speaking - DX'd at age 38
"Aut viam inveniam aut faciam." (Hannibal) - Latin for "I'll either find a way or make one."