Quiet this internal noise by putting some of yourself into your class. Illustrate all points and concepts with examples, anecdotes, and stories. Storytelling is a basic and time-tested mode of communication. Illustrations make good listeners by making concepts more clear, vivid, and memorable. This internal noise can be attended to by involving students actively in the lesson for the day.
Research confirms that students learn best when they are actively participating.
There are a host of simple, low-risk, active learning techniques available to punctuate lectures as well as more complete exercises designed to engage students. Space does not permit a listing here, but you can contact the Teaching and Faculty Support Center for ideas you might want to consider. We may not even be aware of it when this internal noise creeps in. When we have taught a course repeatedly so that it becomes routine, we can become stale and unwittingly give the impression that we don't care about the subject. Sometimes it is beneficial to throw away the old dog-eared and yellowing notes and start over again.