The person's gestures, or lack of them, may be distracting. If you feel unworthy, and therefore intimidated by the person you're speaking with, it's hard for the communication to flow. Become conscious of your communication. Awareness is the first step to change. Start noticing how you communicate, how you listen, which barriers are getting in your way.
Intention is a powerful force that sets change in motion.
Give your attention fully to the other person. If you find your mind wandering, pull it back. Refocus on the message and its meaning. You might get through more easily with a visual person by drawing a diagram. And a kinesthetic person would learn more easily hands-on, rather than watching a demonstration or hearing an explanation.