I don't know how I will forgive myself for this.
How would it feel if you never forgave yourself?
I think these people want to kill me.
It's bad to do anything that causes harm to others and makes them angry.  However, whatever you have done to them, you should seek their forgiveness, otherwise it will keep hurting you as well.  Try to find a way that you can make up for the harm that you have caused.
I'm not sure, how can I make up for what I've done?
Next time try to stop yourself from doing something bad. Second you can go apologize or if you are scared write a letter or note explaining what happened. They might not forgive you but you can have a clear conscious.