Help me with underarms sweating

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Hello there My name is Marisol and I do gymnastics and every time I do gymnastics I sweat under my underarm and my coach is like hands up and I never do that because it affects me a lot and I just get nervous and say are people going to laugh and I try this product called Sweatblock and it was working but no any more I really need your help is there anything I can do contact me right away.