Please give me one rational reason to live?

Life. Your reason to live is life. No matter how tough times get, it's all behind you. It's your past. You can't change yesterday, but you can make tomorrow much better. Meaning, you can't change your past, but you can make your future a lot better. I'm really sorry to hear your story, but I'm sure it's going to be okay. In life, you really have to do something about these times. But trust me, it'll be okay. You have a reason to live, and sometimes, you have to live all your life to find that out.