Thanks for the reply.
Well, from the features which you have described about your son's behaviour , it seems probably he is suffering from A Personality Disorder , called as Schizoid personality disorder
, as emotional coldness, detachment , lack of friends and close relationships , preoccupation with fantasies , lack sensitivity and have difficulty to strike close relationships , little desire to mingle with the opposite sex , that is why he has not had any girlfriend so far ( he is not homosexual , it is due ti this personality disorder that he does not mingle with the girls) ,such schizoid personality disorder patients underperform in their school or colleges , and in fact are not interested in gaining knowledge through such mediums, and lack enjoyment in life (anhedonia ).
So, i suggest you consult a Clinical Psychologist and get him evaluated for Schizoid Personality disorder and this will confirm what i have proposed here.
As far the treatment of Schizoid Personality is concerned , it will be a tough task for you to get your son to meet the psychologist , get evaluated and then get started on the treatment , as schizoid personality patients , do not trust health care professionals and shun any kind of interaction with them , but , any how you have to coax him to see a Clinical psychologist , and get him evaluated.
The treatment is a bit tricky as their is no specific treatment for ths condition but the folowing three options are the ones which are given in Schizoid personality disorder.
1)Drugs -- Wellbutrin (bupropion ) an anti depressant used to treat the lack of enjoyment(anhedonia).
Risperidone (risperdal) or Olanzapine (zyprexa) , for social problems ,and emotional flattening, and coldness.
2) Psychotherapy -- that is counseling offered by a clinical psychologist ,and the best counseling / psychotherapy for Schizoid personality disorder is Cognitive behavioural therapy which will be provided by a psychologist.
3) Group therapy
I am mentioning below a link to a site which will throw more light on Schizoid personality disorder and make you more aware of your son's present condition.http://www.mayoclinic.com/health/schizoid-personality-disorder/DS00865
So, i suggest you consult a clinical psychologist and get your son evaluated for Schizoid personality disorder , and get him started on the treatment mentioned above.
I wish your son best of health.
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