nobody takes me seriously because im “too young”

i dont know what to do anymore. im only 15 and i have never felt more hopeless in my life. i dont go to school, im not intelligent, and i attempted suicide by taking a bunch of prescription pills around 2 weeks ago but it didnt work and nobody really knows about it. i so badly wish it had worked. my girlfriend says she loves me and wouldnt recover from it and shes really the only thing keeping me from doing something more detrimental, but of course id never tell her that. i dont want to burden her. shes been through so much and i hate that shes the only person i feel will understand me, because i just dont feel like i can talk to her about it. im not on insurance and had to stop going to therapy, so i really have nobody to talk to. i tell my mom how deeply suicidal i am and she doesnt believe me. i dont want to hear that im “so young” and that i have “so much to live for.” i have nothing going for me. i dont think she’ll believe me until i actually kill myself. its not some fantasy for her sympathy, some “she’ll be sorry when she finds me dead” i just want out. my life has been so miserable. i feel selfish because i know people have it a lot worse than me. im just so tired of being some miserable suicidal teenage girl. im just another fucking statistic. ive been scratching myself as a way to cope because im too scared to do anything that hurts more than that. i wish there was an easier way out. theres nowhere in my room for me to hang myself. if some attempt doesnt work and i get taken to the hospital, my mom would have to pay for everything out of pocket. we cant afford that. i just wish i could die some way or another. i dont think ill be mourned for more than a week because the world wont stop spinning just for me. i am nothing in the grand scheme of things. i dont care what happens to me anymore