i scratched a car without a license but i dont know who is the owner of the car

hi so like the title said, im having my driving test next week so technically i dont have any license on me right now. drove to a busy street for dinner but like i said, it was a busy and narrow street and there are parking lots by the side of the road. i was trying to reach for my touch n go card to go into the parking building but suddenly there was a loud crash. didnt have time to check cuz it was a t junction and i had to make a turn immediately, but i saw the shocked face of the passerbys and the car behind me. i parked safely and called my mother about this. later on, i walked back to that street to identify which car ive scratched, but i cannot find a car that has a visible scratch, although my car has quite a long and evident one. what am i supposed to do onwards?​​​​​​​​