Don't be a fucking douchebag. If you hate yourself that much, just take your own life and be done with it. If you think for even a second that you're going to make any kind of difference by shooting up a school, you're wrong. NOBODY will care about you, people will praise your death. They'll avoid saying your name because you will be a nobody. Nobody remembers the name the meteorologists give the tornadoes that tear apart their homes. They'll be fucking HAPPY you're dead and your entire life will have meant nothing but pain and suffering. Not only for you but for innocent children and parents. But that's not to say you're a lost case. The fact that you're posting here means that you're looking for someone to talk you down from the ledge. It means you don't want to do it. Either that or I'm definitely taking the bait.
If you decide to push down your insecurities and make your life worth living.. you're going to look back in 5 years and cry. You're going to cry because you'll be so happy you didn't do this awful, selfish thing. You're going to cry because you now have things to live for, people you care about, and people who care about you. And the thought of having killed yourself and never getting to meet these people or experience a deep love for another human being will cut you deep like a hot knife. What you're feeling now is not permanent. NOTHING IS PERMANENT. And if you feel that you were dealt a shitty hand and this is your only redemption - You're not only wrong, you're a fucking moron. YOU are solely responsible for what happens to you and how you feel. DO NOT put your worth in other people or things. They will always let you down.
Don't be such an egotistical, dickless, coward OP. Go out and live a fucking real life. Stop posting about killing people on a fucking anime image board, it's pathetic. You don't have to be a shitty person. It's your choice.