Sorry that this happened.
it is so hard for me to accept the fact that i think of killing these people.
What can i do? How to get peace in my mind?
I think it's natural to have some desire for revenge on people who have hurt you. I don't think you should try to force yourself not to have those thoughts, or feel guilty about them. However, there may be cases where you can replace those thoughts with more peaceful ones, without repressing your feelings.
At times, when you catch yourself having violent thoughts, you might ask yourself, "Do you I really need to think about this right now?", or perhaps remind yourself that this was something in the past.
Another approach might be to wish for something good for yourself, or for the world as compensation for this event rather than wishing harm on your enemies.
I heard a story about a yogi who was said to be able to project energy into the heart chakra of other people, causing them to having overwhelming feelings of love. So instead of imagining yourself beating the crap out of your enemies, you might imagine having the power to project overwhelming feelings of love in the their hearts, causing them to weep and feel great regret for hurting you. That might help to satisfy the emotional need that you have, while yet being a more positive thought.
I've also hear that there are martial arts where you can knock out or subdue an enemy without hurting them, so imagining that you can do that might be a more positive approach.