Talk to a priest about this, please. It's a fear that you need help to rid yourself from it.
Social anxiety can be so intrusive in our lives; I have it, too, but I know the causes
in me--my mother's fear of others-- and only years of experience with caring and positive people has brought me out of it. I still tend to be an introvert, though. Therapy was very helpful in this regard, also.

Take care.