Imagine when someone calls your attention and you finally surrender everything - just to pay attention.
When you’re listening to someone, truly listening, you block out all other distractions and they become your everything. Your full body language should portray this.
Usually, if someone is speaking to you or to a group of people, their goal is to have an emotional impact on you, or for you to understand their emotions.
I hope this helped, I also had to take conscious control of my behaviors in order to boost my confidence and develop better social habits. I teach exactly how I did that though a course on Developing Confidence From Within.
Good life to you.