I always look nervous and scared

I have social anxiety and whenever I speak to people they can straight away notice that I look nervous today I went in for a casual meeting and the person had this worried look on her face and she was like are you alright? you seem nervous? Once when I was walking down the street, a guy stopped me to ask for directions and asked why I was scared and worried. Normally, people will tell you that your anxiety is all in your head, but for me, it shows, which is embarrassing me greatly, and I’m at a loss for what to do. I’m curious on how my face appears when I speak to people in order for people to notice how nervous I am.