Why do I sweat a lot?

Ok I sweat A LOT. WHen it's super hot out, i start sweating like crazy.. the entire back of my shirt gets drenched with sweat, but i'm not unhealthy. i take care of myself, and i'm in good shape I swim competitively from Mon to Sat every week, and now i started water polo and badminton. Water polo is 4 days a week and its hella intense. But when i do badminton or any running or any intense avtivity out of the water, i sweat a lot. during conditioning, I staart sweating like crazyyyy. Buckets of sweat going down my face, and back.. and blaahh blah. i eat whatever i can.. but i like to eat junk food. i dont eat really really salty foods. i also eat my fruits and veggies.. and i hav ish ish of a well balanced diet.......so how do i stop sweating buckets and start sweating like a normal person?