Playing the devil's advocate here, but I believe you deserve to have a choice. If you are convinced you cannot live, you can take steps to have custody changed now, so they will already be transitioning when you transition. If you have family, you can ask for 'temporary' assistance. Talk to local religious leaders to see if there's a way to 'temporarily' get their help. As much as possible, avoid the possibility of your bus trip being disclosed, though it may be the only way to get custody transferred. The bus will be waiting when you get discharged.
I am not encouraging a bus ride, but I absolutely feel you have the right to choose. I would love to agree with all the posts above that try to dissuade you, but...
No. It is your choice, and frothy emotionsl appeal seldom suffices. If you feel that your continued misery will harm them more than being in foster care or raised by family/friends, so be it.
Of course, every method I pointed out above is going to filled with pro-lifers who WILL try to dissuade you, they're legally, and in their minds, morally, obligated to do so.
I know my perspective will draw heat, but I'm here for @cherry333 's and @Rev346 's peace of mind. I believe there is a way they can have freedom of choice, while taking steps to reduce harm to those they leave behind.
I wish all of you peace, however you choose to find it.