Why do I have imaginary friends?

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I've never watched the movie "A Beautiful Mind". But if I read resensinya, I feel somewhat similar to the behavior of John Nash in the movie. The difference, my imaginary friends are invited to speak are real people. They are my friends everyday in the real world. So, I spoke to was "a real friend, but the version of fantasy / intangible." When I'm alone (in the bathroom, bedroom, or a parking lot) are NOT AWARE I like reflexes simply speak for themselves, but actually what I was talking to imaginary friends. My imaginary friend amount equal to the number of my best friends in real life (because my imaginary friends are "real friends version hallucinations"). For example, in real life I have a friend named Lola, so my imaginary friends are also the Lola's (with the character and nature as the original Lola.) Surprisingly, chat topics that I talk to imaginary friends it's a topic that I would never tell them when in the real world. But, the topic itself is a real place (eg, a problem which I experienced heartbreak, dimarahin parents, ideals, etc.). Actually I have quite a lot of friends in the real world. I am including easy going, even with new people though. My friends often judge me as being outgoing and humorous. I do not know if it has to do with my habit of talking to imaginary friends? When chatting with imaginary friends it (eg, the Lola was) I frequently discuss and ask him. Then I imagined when Lola is answering my question, then I'll shut up (meaning to listen to her answers.) Then, after I felt Lola had finished speaking, I will start talking again. And so on, like chatting with people in general. All actions that I did not realize. When the chat is over, then I realized, "Oh, yes, before I begin again to chat with him ..." This has been happening since childhood, perhaps from a toddler. But I do not remember why I like this initially. All just happened. Are not the children from toddlers already have imaginary friends? But my friends the other says they are no longer talking to myself like that. So I thought it was weird with my habit of this. My question: 1. Are these symptoms normal? If not, what is the name of this behavior? 2. What cause? 3. If bad, what should I do to fix this?