How to kill myself painlessly?

I'm a 15 year old girl
i know you will say:"think about your family", but my family is the reason.I
I used to have all grades A's, school was one of the only things i was good at, but now at the end of the first semester i have 1 C and 2 B's. I go to a private school/college, and it is a really strict school and the reason why my mom sent me there's to learn german and to have the chance to go and study in germany, but i lost my chance, i try so hard but german grammar is just so hard. But when i had all A's my parent never, i mean NEVER said well done or anything, all the other kids got iphones and things if they had all B's, but i didn't wanted anything, i just wanted them to be proud of me, i wanted them to say"well done, we're proud of you, but no. That never happened, my teachers and friends always said:"god knows how proud and happy your parents are for you, wonder what they have planned for you", i just smiled and never answered them. And i also can't stand my mom saying everyday things like:"you are the worst kid in the world, you have failed your life, you are worthless, you have no future, i just wanna go away from you, you will give me cancer". Maybe she is right, she had all her hopes on me and i failed her, i don't deserve her…
i only told you my story so you won't try to help and say i'm just an attention whore, just please tell me if you know a quick and painless way to kill yourself,(without a gun because i don't have a gun and i don't think i can find one)

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