I want to kill myself. It's not like anyone would care

My mum is really sad and is taking out all her anger on me because my cat is very old and going to die soon,vets recommended that we should put her down. She gets loved and praised all the time just for being a cat. My parents punish me for the tiniest things and saying they're in the right and I'm "unreasonable" just for complaining I don't like something they like. I was scared to post this because they punish me for saying bad things about them. I wish I could kill myself it's not like they would care. I'm worthless and you are probably on the cat's side too. You probably don't care about me either. But I don't have the right tools to kill myself.