Humans are social animals--which seems cruel to those of us who are introverts, or otherwise feel like we don't fit in. I can offer the same trite advice that I'm constantly getting--smile, be friendly, be outgoing, etc, but that doesn't really cut to the heart of the matter. We crave other people, but it's sometimes hard to be with them.

The best I can do is say don't give up! Things are hard, but they'll get easier, eventually. And, there's a very good possibility that your friends haven't turned their backs on you as badly as you think. In the mean time, there's nothing wrong with hanging out with family. I consider my sister as my best friend, and one of my few confidants.