the brain is an amazing thing. when we want or need something it starts focusing on that....

when a person is lonely their brain naturally starts thinking and daydreaming about people, thinking and daydreaming about being around people, thinking and daydreaming about engaging in conversations with people....

lets take it out of context of lonely for a moment...

think about what you ate last... what just happened? your brain caused you to remember what it was like to eat that last item or meal.

now think about what you would like to have that you havent ate in a long time. what just happened? your brain naturally started thinking about that and daydreaming about that.

well loneliness and boredom make the brain do the same thing... think and fantasize on things we want or need.

since you are fantasizing about talking with people my suggestion was maybe you can find ways that you can actually be around people and talk with them. this may help you to not feel so lonely and not have to fantasize so much about doing it.