Its actually the sweet spot. It takes a while to get your cardio fitness up to a level where you are comfortable spinning your legs at that speed. It may however same you problems with your knees later.

To much torque is hard on the body.
To high a cadence is hard on the heart/lungs.

A balance between the 2 is essential.

Cadence also depends on the type and location of the riding you are doing. It is easier and more useful to maintain a higher cadence on the road but not quite so useful or practical when maneuvering in/on dirt.