Everyone has a life. Everyone has a purpose. Everyone has a meaning. Suicide means you throw out those chances. You have the possibility to grow up to achieve something, to become something better than you ever think you could possibly be.
If you still think your life doesn't matter, then know that other people do too. What about after the suicide? What then? What about all your friends, your family, your mentors, and those you taught. What of them? You cannot commit suicide knowing that other lives will be hurt in the process.
And don't say you have no family, friends are family in every right on their own. You share moments with them, have fun with them, you make each other's day. And you can't do something that would make your family hurt.
If you're being insulted or bullied. Then I want you to look at that loser dead in the eye, and say, "F**k you."
Share this with them.