Anxiety can be a hidden fear about people and how they are going to judge . I don't care or a carefree attitude will help overcome social anxiety. Start small, it's a fear and you have to face small anxiety causing problems once you can face that , then move onto problems that make you more anxious. Hope you understand, start gradually. If in the social situation, there are 100 people or 30 people. start showing yourself socially in front of 1 or 2 people then 5 people, once you get confidence gradually increase to 8 to 10 people and so on.
Next Steps
consult a psychologist to cope up with social anxiety like when it all started.
Health Tips
read self help books on how to overcome social anxiety, so you understand what is actually happening to you on a deeper level, which can help you understand yourself better and gel calmly in social surroundings.