My younger brother have strange problem, Currently he is studying at class 9 and his age is 16 year. At childhood i.e up to class 6, He had created a imaginary world and most of time he was found in his fantasy world. He had created a parallel country one of his real friend was also member of his fantasy game. He have left this imaginary game 2 years ago still he is not able to deal with real world. For e.g. Most of the time he convince himself that he is member of real world not imaginary world. In real world he don't find himself comfortable. But he also don't want to play in his imaginary world. He is struggling between real and imaginary world. This cause a strong headache to him. He look very normal. He have active life So if he had left his fantasy world, what is causing the problem in real world? 1. How common this problem is for a 16 year old student? 2. ?Can this problem will be solved automatically after some year or do we need to visit the psychologist?