Suicide, The Forever Decision by Paul Quinnett is an excellent book for those considering suicide and I highly recommend reading this before making any decisions about your life.
http://www.suicideteen.com/teen-suiicide-chapter-6.htm
I can understand feeling so depressed that you wish it would end. But you must believe me when I say that those people who love you, your families and friends would be forever changed by your decision.
The horror of finding a loved one with their brains scattered from using a gun is a picture that won't leave your mind.