Get a physical job that requires doing lots of physical man-stuff. Then you will sweat like **** but it'll be the good sort of sweat, the sort that says "Oh yeah! See that sweat, boy? That's MAN sweat, from doing a MANS job. None of this sissy sit-down-ohh-cup-o-tea-very-nice-thankyouverymuch crap! GRRRRRR!", rather than the bad sort of sweat.
Works especially well if you have a good muscle-to-gut ratio (i.e. lots of both), a hairy chest, work with old tatty jeans and often work sans shirt.
Alternatively, see the GP. It may be some kind of medical condition that can be sorted easily. I'd see the GP first before jumping straight in to buying the funky anti-sweatalot stuff. I used to sweat a bit around the armpit area at work, was more psychological than anything else. I left the job and have been fine since.
Actually, forget that - just go and buy Driclor, liberally apply it to your armpits and, er, film it as well for the craic. I'm hoping for a Home Alone-style Kevin-tries-aftershave-for-first-time style scene. Seriously, I'll give you chocolate.