how do you know that johnny knows that he has been seriously injured?
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We can infer that Johnny understands the seriousness of his injury when he tells Ponyboy that he doesn't want to die.
"I don't want to die now. It ain't long enough. Sixteen years ain't long enough. I wouldn't mind it so much if there wasn't so much stuff I ain't done yet and so many things I ain't seen. It's not fair. You know what? That time we were in Windrixville was the only time I've been away from our neighborhood."