Johnny talked about suicide before he was in the hospital, but now that he is really dying, he wishies he could live longer. why has his outlook on his life changed since he was hurrt in the fire?

I think that there are a few reasons here. When people are dying, they often have a new appreciation about life. In the hospital, Johnny laments about all the things he never got to experience. He sees his life cut short before he had the time to discover himself and the world.