MAJOR sweating problem?

ok so im 16. At school i have to wear a zip up or a sweat shirt. or even a black shirt. My armpits sweat soooo bad. Bascilly if im wearing a tight shirt for about 1 hour u can deff tell im sweating. I have tried all kinds of deoderant. I have the arid xx extra extra dry. that dosent work to well for me. And im 16 so i wouldnt be able to get botox. Has anyone ever had this problem. its so embaring and im soo concious of it. its really really really annoying... please any suggestions?