How can I stop from sweating so much?

My armpits and my butt sweat. A LOT. I've tried a lot of things and have recently gotten this new deodorant (about 3 weeks ago) called Mitchum, only to find out that it doesn't work. This is really hurting my self esteem because I can t wear shirts with sleeves anymore. Somebody please help :(
How can I stop from sweating so much?
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