i know this may not be the same at all... but at times when life gets tough and I feel a lot of pressure from what is going on around me I get really anxious for a while, but then if this state continues I end up just shutting down and becoming apathetic. I convince myself that I don't care about whatever it is that is going on in my life and that I would be better off not having to deal with it. I know this may seem contradictory, but sometimes when our minds tell us that we don't care about something, say living, this actually means that we actually do care about it. in fact, we care about it so much that the thought of failing, of having to face a shitty situation seems so frightening that we just cop out and decide that we don't care. What is worse for your ego than having to face the fact that you did not succeed at that which you wanted most?
im going to go out on a limb here and say that you feel scared because you don't want to die. I know you think you do (and please don't take this as me trying to belittle you or manipulate you), but what I think you really want is to live and be happy. now im just some rando on the internet so I have no idea what would make your life worth living (that's up to you to figure out), but it seems to me that you would rather live than die. I have been where you are. I know what its like to wake up every day wanting to end it all, but these feelings are not you.
Pain is an adaptive response. The nervous system allows us to feel pain as a warning sign. It tells us that whatever we did to experience this pain is not good for us and this uncomfortable bodily response prompts us not to do that again. the way you feel right now is not a call to end it all. it is a call to make changes in your life because you know it is not that way it should be. and dude, next year you'll be in high school. I guarantee that your life will be completely different then. elementary school seems like such a small world because you're stuck with the same people for like 10 years and it can get pretty old, especially if they decide they don't like you (which is THEIR problem, not yours), but high school is your chance for a fresh start. You'll never get the chance to be happy if you "puss out" on your life now. I don't know about you, but Id rather die happy.
Oh yea, and even if you do drug yourself up, the way that you're planning to go sounds really painful.