Communicating your science to others has a lot to do with empathy.
Look at the person in front of you- and now put yourself in his/her shoes.
Try to imagine what they feel and how you are perceived by them when you tell them about your science, while using unfamiliar technical terms and jargon.
You have years of accumulated scientific knowledge and mastering your expertise, and of course a title you well deserve- a scientist. This may seem quite intimidating to the average person.
But, when you are empathic to your audience, you stop and think: "How am I being perceived by the other side? Do they understand me? How would I feel if someone spoke to me using words I didn't understand?"
Empathy is key to your communication with others. Use it when you talk about your science, everyone will benefit from it.