this is called social anxiety. you are nervous when you face new people or any people. This is different then panic anxiety disorder. In social anxiety you are more shy then regual people, you feel like people are watching at you, you are shy to eat at public places. One of the most effective therapy for social anxiety is a group therapy where you are encouraged to speak up in the group. They encourage you to do more social work and have more interaction with different people. It is assumed that social anxiety disappears slowly,  without any therapy, in your late 40s. If you think you are hurtin yourself  by not able to do anything then get a medical help for this. Most of the state run hospital look at any mental disorder for free or a minimal charges. It is not consider as a big mental disorder becasuse most of the people face this problem in their teens, especially in the asian countries. But some people develop it in their later lives. So if you think you are having a hard time then go and seek for medical help. like i said it is usually free in the state run hospital.