I can understand, one way of dealing can be- giving yourself positive affirmations that nothing would happen.
You can confidently manage a conversation.
Try to always make the first move and slowly have exposure of social settings start with one or two people.
Start taking baby steps by talking to people your comfortable with
I can understand i was like this only but gradually i observed other people how they talk, how they present themselves in front of other people, comebacks etc and that's how learned you can try too