If you trample a kitten to death, you must first dispose of the cat's body. Please make sure to give the cat the dignity and respect it deserves. You may consider burying it somewhere quiet and comfortable, or contact your local humane organization to see if they have any suggestions on how to properly dispose of a dead cat.

If it was accidental, you can deal with your emotions and don't be too sad. If it is intentional, this kind of behavior is bad and constitutes abuse. It is recommended to seek psychological support. It is better not to behave like this again in the future.