I don't think if it is normal but I have imaginary conversations with friends for long time and before that I used to have conversations with imaginary friends. I also have normal talk with friends every once in a while. The way I see is that these imaginary conversations drastically reduce my needs to actually talk to people. Also IMO once I have has enough conversations with people I pretty much know what they will talk about next time in general unless they have some personal news to deliver. So in Claude Shannon's sense total information content is very low and I do not even find them funny to continue talking.

Now it all may be odd sounding thing but it seems okay for me as I do not look to confirm to any group nor looking for anyone to confirm to my ideas.