People can get social anxiety from various things such as public speaking, being in large groups of people, eating in front of other people, or making small talk. Margarita Tartakovsky's M.S article on psychcentral.com discusses various ways to help you deal with these anxietys. For example if you have severe social anxieties that keeps you from going to school or from going out in public, therapy would be a great option for you. If you experience slight anxieties from certain social situations, Margarita suggests trying deep breathing.
Click here to read the full article by Margarita Tartakovsky M.S at psychcentral.com.