Just remember, that no matter what, you are always loved.
I'm assuming you're religious, because this is in the religion/spiritual section. Pray to Heavenly Father. He loves you. You have people on this earth who love you, and care about you more than anything. I know it sometimes as if there isn't a mortal soul who understands, or cares about you. But trust me, someone does. and even if they don't Heavenly Father does, and in the grand scheme of things, that is all that matters.
If this was put here by mistake, and you are not religious, well then I just have to say: you only get one life. Don't end it. There are people who would kill to have the same opportunities you have. and although there are many problems in the world, don't focus on those. Remember all the happy parts of your day, and of your life. If you are now thinking "I don't have any happy parts", even the most depressed person on the planet cand find at least one thing they enjoy. I love you, and care about you. Please don't fix a temporary problem with a permanent solution you may regret.