OMG YES the awkward talking! My videos would be SO MUCH better if I didn't have to talk in them! For me, I'm not having issues with stuttering or saying one word too frequently, but I just don't know what to do with the tone of my voice. I'm naturally pretty monotone - but that would make for a very boring video. So I've been throwing my tone up and down, and when I watch myself, I can't help but cringe.
But like everyone's already mentioned, the more videos you make, the more natural it becomes.