While landing, the private pilot crossed the runway threshold at 110 knots at 50 feet above ground level. The pilot attempted to perform a "soft landing" which resulted in a longer flare distance. After touchdown, insufficient runway remained to allow the airplane to be stopped on the prepared surface. The airplane departed the end of the runway and was substantially damaged. The pilot was able to egress without assistance. The pilot stated that the accident could have been prevented if he would have maintained a slower airspeed on final approach and shortened the flare distance.