Some people do have this problem. Can you tell me that if it increases on eating only bcoz there is a disease in which people get sweat only on face while chewing. If the symptoms are alike please tell. Otherwise in this growing age group it can be a normal phenomena also bcoz thyroid is sometimes much more active in this age which is just physiological or normal and may be due to sympathetic overactivity. If there are no such symptoms associated except sweating
nothing to worry it will subside otherwise consult a doctor.