Im like this I have had panic attacks because I thought I get lost in the crowd. My biggest fear is being stabbed or really being laughed at, so crowds and social situations scare me. I still cant go up to a person and introduce myself but getting better. My best advice is just do it. Its hard, you can panic easily things can seem more dangerous than they are but once you do it going in crowds isnt so bad. Just remember most people are good people.