Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. From the description it shows that your son is introvert. But detailed studies and psychometric tests are required to classify as introvert. I think it is his personality. So many people are introvert (partially). Nothing is wrong. You have to worry only if he is unable to perform where performance matters. Unable to speak when speaking is essential, etc. If required, you need to change his attitude towards life. For that purpose, first take him for a counseling and then, if need be, consult a psychologist. We shall decide what is to be done after thorough diagnosis procedure. For more psychotherapy techniques, You can post a direct question to me in this website. Include every detail as much as you can. I shall prescribe some psychotherapy techniques to control your condition. I am sure that the techniques should be a success. Hope this answers your query. Available for further clarifications. Good luck.