There are many people who have suicidal thoughts or wished they were dead. The whole thing about being an adult, though, is that you have responsibility to more than just yourself. By killing yourself when you just don't want to live, you are taking the easy way out. My brother had his 16 year old son living with him, a 13 year old son that looked forward to visiting his dad every year on summer and winter holidays, and a 10 year old son desperate to get to know his dad, and he abandoned them when he pulled that trigger. He also abandoned the rest of his family, including my mother who is on oxygen and in poor health, my father who considered him his best friend, my brother and his family, and myself and my family. He has two nephews and a niece that he never got to meet because he took the easy way out, and every day I miss him and wish he was here to play with my daughter or to counsel his two now-adult troubled sons who can't seem to stay on the right side of the law.
Suicide effects more than just the dead. No matter how bad I feel or how much I wish I would die at times, no matter how bad my postpartum depression got where I just wanted to drive over the side of a bridge, I never did, because I know that I have a responsibility to those who love me, no matter how little I may have loved myself.
I believe life is not just a gift...there is more to it than getting what you can out of it. If you go through your life helping or pleasing only yourself, then there isn't much to your life, and it was wasted...IMO.