Hi, it seems like you might have social anxiety. It will be helpful for you to think of all the triggers that make you feel this way( how many people are there? What do they say or do? What are the thoughts in your mind during such situations? How do you feel physically? etc). Sometimes our irrational or unhealthy way of thinking can cause us to feel unhealthy emotions which in turn affects our behaviour. By changing your irrational thought, you can change how it impacta your feelings & behaviours.