It seems to me that in such cases, first you need to learn how to calm down. This seems impossible at first, but later it starts to work out. Try to notice the thoughts that come to mind (because everything starts from mind - emotions, feelings of anxiety, etc.). When you begin to fix the very fact of the appearance of negative thoughts, then try to replace them with good thoughts, from which you feel good. It is not so simple, but after a while it will start to turn out easily. When you learn to control the flow of thoughts (and, as a result, an anxiety), you can study what meditation is and start applying it, because it really helps to stay in a good mood.

It is important to understand that all people in one form or another experience this. You are not the only one, there are a lot of people have social anxiety. It is also important to understand that it's normal, it is simply not always possible to control the flow of thoughts.

And I'm not a doctor, but I believe that this should help any person feel better.

For example, I used to be an introvert, was afraid of communicating with people and society. But, when I learned to control the thoughts in my mind that tell me that I’m not like everyone that I have some kind of problems, then this passed, and now I don’t feel any problems with it at all.