I have been in my new job for 2 days, one of the girls is having a Cocktail Making evening for her birthday to which I've been invited. I don't want to go but feel that if I don't I will appear antisocial. I gave up drink after having problems with it in the past and now just going into a pub makes me anxious. What shall I do? If I just make an excuse of being busy I've a feeling they will change the date to fit me in.