First of all, I think you have to go alone to those different parties, you never know when you can meet someone
and about your loneliness, it's not a big deal, nobody has died for it, isnt' it? Besides you always have other people to share, like your family, your co-workers, your friends, so please, don't be sad at this season, remember that there are a lot of things worse than to be alone!
Happy Holidays!