I'm thinking of the only reason I'm still here is because my parents wouldn't be able to afford a funeral
Did you come to this conclusion when thinking of suicide?
Yes, but not about how I'm going to do it or when.
Thinking about ending your own life and your funeral arrangements is a sign of deep depression and a mental health crisis. You should talk with a mental health professional to get the help and support you need to be able to appreciate life again and not want to commit suicide. Your parents love you very much and they want the best for you and so you shouldn't take your own life.
As I've said, I'm not going to kill myself because the funeral would cost too much.
But the fact that you still think about suicide is a big deal. a lot of people live with depression and still suffer from it. Don't you want help to manage it?