I was driving slowly at a parking lot of a supermarket and preparing to park on my right. When I saw a car on my left front backing up, I pressed on the brake pedal immediately and turned the wheel slightly to the right. All of a sudden, the Tesla accelerated on its own with a very strong force and high speed, with the wheel turned sharply on its own toward the right. The Tesla then run through the steel fence of the parking lot, flying past the sidewalk, and finally settled on top of a big rock on the ground (which is placed there to protect the supermarket building). All of these happened so fast with such a strong force and all in an unintended manner. I was not injured and luckily no other persons or vehicles were involved. However, the vehicle was totalled and there were damage of the supermarket property.