I'm just like you. I know this must seem weird/very uncommon to most, but until very recently, I just never did sweat. The only exceptions to this were sweating during a really intense workout or doing gardening/yard work in the blistering desert heat. On a regular, every day basis, I just didn't sweat. I asked my husband, just to be sure I wasn't immune to my own scent....but got the "all is well" verification from him, so never used deodorant.
UNTIL recently....to my horror and surprise, I started to experience this weird underarm feeling when I'm doing absolutely Nothing! I'm just standing around and all of a sudden feel little these little beads of sweat! Not happy! I'll be 50 at the end of this year, so things are changing, I guess. Not really looking forward to all this.....
Anyway, I recently got some natural deodorant, and then last week found a really great smelling DO/AP without aluminum at a department store. So, now it's a new thing to add to the morning routine after showering. Once a day has been enough, so far. I guess I'll have to wait and see if the whole re-application thing is necessary as time goes on.
Oh, the joys of aging! At least I know I'm not the only one!
J. F.