Haha, interesting on the comment about having tried to make imaginary friends. It's ironic that we can't even make friends who don't exist. I too have tried to have imaginary friends, I have a fantastic imagination, but I was always to aware of reality for that. Instead, I have deeply detailed fantasies, ever since i was little. I just sit down close my eyes (or not) and just get to this nearly dream-like state, but I'm sitll awake and alert. Most of my "dreams" are usually extensions of books I've read (I love reading : ) ), inserted myself into the plot, and continued that plot or rewritten it. I guess it doesn't sound all that unusual, but it's always been my one freedom right when i lay down to bed or first wake up in the morning. And these plots become long, drawnout, and intricate, I usually carry on with one for several weeks, then abandon it for another, then come back to it in another few weeks. My actual dreams are grey in comparison to my fantastic adventures. I was also crazy for fantasy books when I was little, they make for the best daydreams.
I do the thing with constantly speaking with myself inside my head, often referring to myself as "we", sort of holding conversations.