I think I have close to opposite of not having an internal monologue, it is hard for me to turn my internal monologue into an external one. Talking takes a lot of effort and I get tired of doing it after a short while. I've conditioned myself to be able to do it well now, and I can be very articulate, but my wife and son, for instance, can just keep talking and talking and talking. I find it so bizarre.

But I can talk with myself internally for hours on end.