Alright lets consider this. Why do you want to end it all? Because it hurts right? And death is a pretty good painkiller. But It is also the ultimate destruction. You wont get to regret it. It is a decision that one can't take, only fall upon it.
I mentioned pain, because if you believe nothing means anything anymore, at least you must believe that things are painful, right? You have your proposal of ending pain with one swift pull of the trigger, but let me tell you of an other way.
You want to not be in pain? Good so does everyone else. Pain in the meaning that our lives revolve around. Needs and wants are endless you will never be satisfied, but you can minimize pain to almost non-existance. Stop focusing on things you want or thing you thing you need. Start, tomorrow even, by waking up, don't listen to parents or anyone, just get off your bed, go outside for a walk and just take it in. Thats all you have to do. The next step is even simpler. Do one thing and only one thing that is productive and positive. Eat a good healthy meal, read half a chapter of a book, write a letter to someone you like, do a few push-ups. You don't have to be perfect, you don't have to even finish any of those things just start doing one of those things.
And then...just keep at it. Keep doing that thing till you start feeling better. Oh yes you wont feel better immediately, it will take time, but if you keep at it things will be better I promise. How do I know? I have been where you have been. I know.
People will be horrible to you, people will abandon you, and even hurt you. But you are not them. But none of them matter. Pain matters, nothing else. You can try to either live through it and with it and conquer it. And you will do all of those. Killing yourself, is an option sure. But wouldn't you want to try something else first? I did and I am all better for it. I will not let this pain win.