Hello. I was once a 14 year old girl thinking about & attempting suicide several times with the absolute certainty I no longer wanted to live
Over 30 years later, I'm still here & very happy to be alive & that I didn't succeed in my attempts at a time when I felt my existence was futile
I'm pretty sure successful suicide suggestions will be against the BLUA & no-one sane is going to advise you how to kill yourself
You have value & worth in this world even if it doesn't feel like that now
Your best bet if you have no-one you know you feel you can talk to & tell how you feel (no family, friend or teachers?) is to contact your GP if you feel able or an anonymous helpline (I don't know what country you're in, but can help with UK ones)
Life that feels unbearable & untenable will not always be like that & there are other options than a final act in reaction to a temporary situation