I have been through tough times myself, my birth mother was killed in a car accident when I was very young. I found it very hard to fit in socially and had very few friends in life and felt like I had very little respect, but in the end I developed coping mechanisms in my head that kept me on a level state of mind. I play and I pray. I pray to Jesus for peace and joy and I play computer games like Tetris or Solitare. I also create machines inside my head and then realise they don't work and try again to make them work. I talk about my problems and I clear my head so I can learn new things. I read, I play and I learn.
If you feel like Jake Davidson and want to kill other people then you need to take steps to remove that way of thinking from your head. You need to remember that you will die eventually so you have to keep your chin up till the end. Try to learn new things instead of thinking of the same stinking thing every day.