Poor coping skills sometime makes the nomal situation to be percepted as stressful and person starts to be anxious even in normal situation and unable to perform upto his expectation.  Social phobia with coexisting anxiety disorder can be a possibility. For stuttering you may need speech therapy after consulting a psychiatrist. You need to learn good coping skills apart from medications. Consult a psychiatrist as medication may have role in your problem. You can also start with only counselling by a psychologist.

U should consult psychologist for proper evaluation of the case and finding a suitable way to combat this situation.