I respectfully disagree, A skinnier rider should sweats less than a heavier rider because he has less surface area/skin.
or one sweats less because they are dehydrated more,,very bad.

Some sweat less because of their skin, less sweat poors, . Think of sweat as a temp controller/thermostat. Those that sweat less can be overcome by heat stroke with less warning, more suddenly.....

Be glad you sweat,,I sweat, get wet, and that's free air conditioning, then I cool down just enough so I can push harder/faster, then I get hotter and sweat more and then I,,,,wait for it, push harder

Get one of these.. three years old now and like new,,It works like no other:
https://store.haloheadband.com/defau...FcWPHwodwG4AcQ

Get the pullover, for a better fit under a bike helmet..