When talking to people, I always feel that my facial expression is unnatural. What happened?

When communicating with others, I always feel that my facial expression is unnatural, which is a kind of nervous performance, because many people do this when they are nervous. What they think in their hearts is different from what they appear on the surface. They want to control it with their heart, but they can't. Therefore, it is said that his thoughts on his face and heart are different, but to eliminate tension will reduce this phenomenon. What is there to be steady and steady? Take it easy.