more confidence with social skills comes with time. when ur in conversations with girls for example, if u havent met them before, then keep it simple. u can use cleshays...say things like 'hey, im ..... i dont think ive met u b4.....wot skl r u guys from' etc.
its okay to not say that much, just keep involved. listen to wot other people say and reply. u dont need to think things up all the time. and also stay in large groups at first. that way there is always a new flow of conversation...