There are a lot of people in the world that deal with social anxiety on a daily basis. Even celebrities deal with this and you probably don't even know who they are! For example, Daniel Tosh is someone who has learned how to overcome his social anxiety.
He is now a world famous comedian and even has his own television show, which is wildly popular. He says that he can connect to his audience by making a character that he uses while he is telling jokes. This allows him to be someone else for a while and interact without the anxiety getting to him. The way that Daniel acts when he is in front of an audience is completely different from the way he acts at home.
When he is performing in front of a crowd he is someone that can get away with just about any joke because of the way he presents himself. When he is at home with friends, he is much quieter and laid back in general. These differences show just how his personality changes when he is up on stage. There are a lot of celebrities that have social anxiety disorder.
Most of them are people who perform in front of crowds and are outgoing. You probably don't even realize this because of how different they act while they are performing. They were able to completely change their lives because they were able to create different personalities that made them comfortable in certain situations.