take step by step. before you talk to the person talk to yourself and tell yourself there is nothing to worried of, everything will be alright. then when you start talking to the person you can count with your hands or imagine numbers or colors it could you be less nervous.
loukeoc
you can also try complementing random people it can help you with socialising and make them happy(:
guiltymussel2
try to relax yourself first that its not a big deal and then talk with them you feel easy