Social anxiety can be treated both by medication and psychotherapy. Self treatment usually fails as it is out of control.

Social anxiety disorder, also called social phobia, is an anxiety disorder in which a person has an excessive and unreasonable fear of social situations. Anxiety (intense nervousness) and self-consciousness arise from a fear of being closely watched, judged, and criticized by others. Symptoms include: Tremors, feeling anxious or nervous, sense of panic, sweating, increased heartbeat, feeling of impending doom, stomach discomfort, dizziness etc  These can be debilitating. If the anxiety us overwhelming, consult a psychiatrist at the earliest. With the right medication and counseling, it is likely your symptoms will improve. Other than that, try yoga, deep breathing, meditation, moderate exercise, progressive muscular relaxation and guided meditation.

Your social anxiety could stem from any number of reasons. Although your anxiety may have started since childhood, it may still be alleviated, atleast partially, if not fully. I recommend you have yourself initiated on anti anxiety medications, along with Psychotherapy, to help you go through this.