Pit sweat and body oder!!!?

My armpits never used to sweat! I'm 15 and I've obviously had my period for a few years now and it's totally regular and I obviously have pubes and armpit hair and all that great stuff whatever. But recently my armpits have been sweating and it's totally not normal for me. They used to be dry!! And now I'm finding that no matter what deodorant I use my pits always stink! What do I do!?!?!