Is it normal that my old best friend is my imaginary friend?
First, a bit of background. I'm a 20 years old guy, never had any real friends, and I spend all my time on the computer, programming (I study Computer Science), reading books or browsing the Internet.
About four years ago, I started to play an MMO game. Having no real-life friends, I made many friends on that game and spent a lot of time playing it. About one year after starting, I met a guy that became my best friend. We spent a lot of hours just talking to each other, sometimes just logging to the game to talk, not to play. We were unbelievably similar, we had the same personality, same thoughts, and we were born less than ten days apart! He even quit his warehouse job and started studying Computer Science because of me.
During that time, I developed the habit of thinking about things to tell him while I'm away from the computer. For example, thinking "I'll tell him that the exam we had today had a hilarious typo" while having that exam. That habit became very strong over the years.
About nine months ago, I lost all contact with him. I have no idea what happened to him, he just disappeared one day.
... And that was the last time I ever talked to a friend. I quit that game some time before that because I had to concentrate on my studies, and that was my only source of friendship.
Now I'm friendless, yet I still have that habit of thinking of things to tell my friend! I thought it would go away after few months, but it never did. Now he's practically my imaginary friend. I don't "see" or talk to my imaginary friend as a person, but rather, I keep thinking of things I would tell him if we were still friends. It's really annoying and depressing.
I realize that my life is pathetic and hopeless, I'm fully aware that I probably will never get a girlfriend, and I know that I "should get more friends". Unfortunately, that is not an option, and it's not related to the question I'm asking here (i.e., does anyone else have such semi-imaginary friends?)
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tl;dr: I had only one friend in my life and now I lost him, but I keep thinking of him.