disoriented behaviour

I have a young boy of 23.He was obedient,and never spoke of sex or girls.He was very studious too,Last year he failed in his final competitive exam Now he has lost his focus and talks abt wantign to goto america or west and talks only abt sex and girls . he is still a shy boy to talk to anyone in person But thru internet he lets his wild fancies flow.His words are always very high in ambitions and not practical at all as of now..He is in a dream world and all his talks are not matched with actions or strength.
Tell me what is wrong with him
Please reply to me at yr earliest

Your son is engaging in excessive day dreaming as a replacement for human relations and effective problem solving activities. Find a psychiatrist or a psychotherapist and see if they can do something for him.