PUT MY CAR IN PARK IN DRIVEWAY WITH THE ENGINE RUNNING, STEPPED OUT OF MY VEHICLE AND IT STARTED MOVING FORWARD, HITTING THE GARAGE. THE CAR HIT THE GARAGE AND I TRIED TO PUSH IT BACKWARDS, IT MOVED BACKWARD AFTER HITTING THE GARAGE AND STARTED ROLLING AWAY FROM THE GARAGE. MY BABY WAS IN THE CAR, SO I GOT IN THE OPEN DOOR OF THE CAR AND ATTEMPTED TO MOVE THE GEAR SHIFT OUT OF P TOWARDS D, THINKING THIS WOULD HELP STOP THE CAR AS I STEPPED ON THE BRAKE PAD. DURING THIS ENTIRE PERIOD, THE CAR WAS MAKING A GRINDING SOUND, WHICH I ASSUME WAS THE BRAKES. THE CAR FINALLY STOPPED ROLLING AND CAME TO A STOP AS I STEPPED ON THE BRAKE A SECOND TIME. THE DRIVEWAY IS ON A DOWNWARD SLOPE SO THE CAR WAS GAINING MOMENTUM AS IT BOUNCED OFF THE GARAGE. THERE MINOR DAMAGE DONE TO CAR BUT THE GARAGE DOOR WILL NEED TO BE REPLACED SINCE IT IS BADLY DAMAGED.