I wish there was somewhere I could take my cat so I knew she would be spoilt and looked after and I could just go quitely die. I had stopped breathing after my brother bashed me and I wish I had just been left to die.... it was easy to die at that point but people had to bring me back just so I could suffer more shit.. why?

Nope, I guess you were right, now that I look at it again it doesn't sound like a suicide letter at all