Sweat really is no indication of how hard you're pushing yourself, or how hard your body is working.
It's only your body's natural self-cooling mechanism. Some people sweat a ton, others hardly do. This morning in my 6am boot camp class I was reminded that I am indeed a sweater .... I went to throw a medicine ball and it slipped out of my hands
There's no real reason for concern, Christine - it's totally normal.