You're bringing up a point here, to which I can relate a lot. Being rather an introvert, going to parties or social gatherings, where I know only a few people, is a big challenge to me. However, lately I understood that I'm missing out on a lot, if I continue to ignore invitations. I will never make new friends and meet new people, if I continue listening to my fears. Of course, it's a challenge to me. But then again, life is a continuous challenge.