Whats the point in life?

Im 16 and i cant stand life. I have caused my mom and dad so much trouble. I have IEAD (intermitten explosive anger disorder). I have caused about $10,000 worth of damage to my mom and dadds house. My parents split up when i was in 5th rde and the stress is pushing I recently broke my xbox which was the only way for me to have motivation to get up. Sine then i have been sleepin for like a week. Id only get up to use the bathroom. Yesterday I got into a figh with my dad to where i was thrown out of the house. So now all i do is sleep. No motivation to do anything. The day i get a gun is the day i end my parents suffering of having to deal with me. I have gone to a mental hospital and hah what a joke the place was. I cant wait tillthe day i die.