Often I'm not aware of my facial expression, and sometimes my facial expression leads to misunderstandings. Sometimes I hear people saying, "What are you smiling about?" and I don't understand why I'm smiling. I would understand if I were thinking of something funny.
Also, some people say I'm shy, and before I didn't understand why people say I'm shy. However, one time when I was meeting new people, one person commented that I looked scared. Then my dad explained that I was just confused. After that, I realized that I had anxiety because of confusion and over-stimulation from there being many people.