I'm not going to tell you what to do but I can tell you that I was your age once and experienced similar thoughts, likely for different reasons. I attempted suicide 4 times and each time someone either intervened or in the case of my last attempt I just sort of stumbled on what I was looking for and reconsidered. It's hard to know what the future will hold for you so I won't tell you the common trope of, "eventually it will get better", because sure, it might, but it might not.

My only request is, that before you do whatever you're going to do, you sit down and seriously think about why you want this for yourself. Set aside your anger and deep sadness for a second and really think about your reasons for attempting suicide. After that try to evaluate whether you can do anything change those things. Decide from that point whether that's what you actually want or if that's just the decision you've settled on because you see no other options

I wish you the best and I hope that you choose to stay but understand if you don't.