Nobody should have to "justify" their suicide, nor should anyone be required to have any sort of "reason" to take their lives. Death is as much of a human right as life is.
That's not to say I don't have my reasons though... because I sure do.
I've been depressed for a while now, I think the first time I seriously felt symptoms of it was when I was fifteen years old, and it hasn't gotten much better since. It's deteriorated to the point where I don't enjoy anything in life in more. Should I make it to my 21st birthday, I really hope I'll be able to drink alcohol and smoke weed because I'm seriously considering turning to drugs in a last ditch effort to feel any sort of emotion that isn't sadness or melancholy or frustration or anger.
Like mentioned by the poster before me... I feel like a failure in life. Actually, no. I don't feel like one. I am one. Yes, I had a huge disadvantage because of the way I was born, but society never considers disadvantages when judging people, people assume the world is completely fair and just. I could have possibly overcome my challenges, but I couldn't. And I don't want to live knowing that I failed my family as well as myself.
Lastly, the loneliness. It kills me. And it could possibly kill me literally one day, or at least contribute to it. I used to have a few friends in high school, but I barely ever saw them again after I graduated. And with regards to romantic relationships... well, I have never been in one, I've always imagined that if I had found just one person who loves me for who I am and actually cares about me, then my life would have some meaning and the opinions of hundreds of others who don't care for me won't matter. But that's just a pipe dream. And this is real life, where pipe dreams don't come true. Guess I'm doomed to die alone. At least that's one less person who will be affected when the time comes.