Sweat in armpits alot.....?

Ok I'm getting so desperate, I sweat a ton in my armpits... It doesn't matter if I'm hot or cold, exercising or sitting down whenever I look theres HUGE armpit sweat stains! I don't sweat any where else and I have tried every deorderant/antiperspirant known to man!!! I would like to know the cause of it (not teenage hormones cause I see no other girls having this serve of a problem) and how to prevent it! Please help me its so embarrassing! Also I have tried putting deoderant on at night using less swipes none of it works!!!!