From I scratched this car to the driver will call the police to the police will take away my driver's licence to I won't be able to drive to I won't be able to get to work to I will lose my job to I won't have money to provide for my family to I will become homeless to I won't have anything to eat to I will die.
From I scratched this car to I will die in less than a second!
Although you can't choose the outcome (you scratched this car), you can change your reaction to it (to keep calm).
Accept the reality and own the consequences. That's the only way to keep a calm mind.
PS This practice guide will help you keep a calm mind and avoid any frustrations when you practice chorale prelude "Heut triumphieret Gottes Sohn", BWV 630 by Johann Sebastian Bach.