The "lifetime" of the pads is just a calculation that the car does based on speed and braking. Until the pads actually get to the wear sensor, the car really doesn't know how much pad you have left. The best way to know how much pad you used is to remove the wheels and measure the pad thickness. You probably have a bit of life left.
The OEM pads are ok for occasional and moderate tracking, but if you're really pushing it, you won't feel like you're getting enough bite.