I'm definitely in no position to provide advice on this matter, but I just want to say that although you feel like some people don't care about you, the truth is, so many more people love you and depend on you.
Everyone goes through rough patches. You're not alone in this sense - yes, your situation seems horrible, but you've got two options: to look at it with a positive outset or negatively.
I really really suggest that you look at your situation positively and know that you're not powerless. There are so many people that want to help you and love you, and want to stop you feeling this bad. Just take the people on BoS for instance; complete strangers want to help you! You're never alone!
So talk to friends, arrange to see the school counsellor, call lifeline. Obviously this is hurting you a lot, so it's really important to start talking about it.
Personally, there was a period in which I hated my life and I thought I had absolutely no one who loved me. Yes, in the moment, it really sucked, but in hindsight, I'm so glad that I didn't do anything drastic. I'm now in a much better place; for me, everything became so much better once school was over. Obviously my situation is heaps different to yours, but my point is to not give up because better times will come.
Anyways, I wish you all the best in your future - just remember, you can always come to BoS for some advice, or just a chat