Social anxiety interferes with one's ability to do many things in life, from basic to advanced. It can make us appear less proficient at tasks than we really are, and it can restrict our ability to open up to others emotionally.
It also keeps
our focus on our anxiety, rather than on the tasks that are before us.
It interferes with our feelings of self-worth and self-love, and causes
us to "automatically" think lesser of ourselves, sometimes without us
even being aware of it.