Have you read Sideways stories from Wayside School by Louis Sachar? It's a children's book, the setting is a school that was accidentally build up instead of across. Its like 30 stories tall, instead of across. The class that provides the stories of the chapters is on the top floor. There's one chapter about a kid, D.J., who was inexplicably smiling one day. Other people were in bad moods, one kid always has mosquito bites, others were in rotten attitudes, arguing, what have you. Every one of them saw D.J.'s infectious smile and forgot their own woes, and smiled, some burst out laughing. The teacher,Mrs. Jewls asks D.J. why he's so happy, but he can't answer because his mouth is too stretched out to say anything. The class offers to guess why he's happy, but no one gets the answer. D.J. keeps right on smiling. Later on the playground DJ's best friend asks him why he's so happy.

DJ : "You need a reason to be sad. You don't need a reason to be happy"

I'm not going to tell you that it's wrong to feel lonely. It's natural, I feel it in spades, but it passes. Escape yourself for a bit. It always helps me.