We vary hugely in where, and how much, our bodies sweat, Lisa. Don't worry. As long as you feel well, you can regard the fact that you don't end up with a red face and rivulets running off your chin as a bonus.
It's said that women sweat less than men, although I'm joining Ross in the wring-out-your-kit camp. When I come in from a run, the kids check my back to see if the heart-shaped damp patch ("cos Mummy loves us all, even when she's out running") is there.
Cheers, V-rap.