How can i not sweat, or sweat less?

Whenever its really hot outside, i sweat..alot. I sweat on my back, my cleavage, and my forehead like around my hair line (that one isnt too bad). But when im sweating, i get nervous that i stink, i dont stink though because i've asked my family and some friends and they say i dont stink at all, its just in my head. but im still nervous about it which makes me sweat more. Im going to my friends Quince and its outside, its supposed to be pretty warm today too and i dont want to be sweating the whole time..Is there anything that can make me not sweat as bad??