Most people have dealt with social anxiety at some point in their lives. Public speaking is a great example. Have you ever had a presentation that made you so anxious that you could feel your heart beating out of your chest and feel your mouth get dryer by the second. I think we all have.
Being a college student I've had to do my fair share of presentations in the last couple years. The anxiety gets so bad that it gives me physical symptoms, and it takes me an enormous amount of effort not to talk a million miles an hour. I wish I could tell you the practice has taken away my anxiety, but its hasn't. It's gotten a bit easier, but mostly I've just gotten better at public speaking and dealing with my anxiety.