Hey there,
I just know how you feel. People who ''suffer'' of social anxiety are affraid to be in big group of people, or even a small one, just because they are affraid to be rejected, himiliated or criticized from people they know in person, or others they never met. The person, in this case you, are too worried about whether you will be accepted, what kind of impression you leave, and how people will react to you. Just because of all this you think about, and worry .... prevents you to relax and indulge in a conversation and general behavior around other people, whether known or unknown to you. I know it is easier to say, than to do....but you have to try to relax and always encourage yourself with the words: '' I can do this, they are all people just like me, everybody can talk with each other, so can do I. This is just a conversation....what is the worst thing which can happen to me if they do not like me?'' The answer, my dear friend, is NOTHING bad can happen to you if people do not like you at the first time. The problem is, you are trying, I mean, you think you have to present yourself in the best way, to fascinate and make people love you. But, nobody is perfect, and there is no person in this world who is loved by everyone who knows him/her. So, all you have to do is to leave those thoughts and to fight with your problem. The only way to win any battle, and to solve any problem is to FACE with it. You have problem to talk with people, the only way to solve that problem is TO TALK to people. You have to do that as often as you can. If there is no miracle, BE the miracle. You have the key to open this door, just grab it and gooooo on. Start with small group of people, go and talk with just one person when you see him/her sitting alone....then by the time you will continue with two, than three persons...etc..b... Start doing some hoby, those places are the best to find good friends because you have same interests.
I wish you all the best, I believe you can go through this, just face with that, I told you how. Best regards!!!!