Castiel shook his head slowly, "No, it isn't. Without the Winchester's, I would not have experienced the things I have." Without the Winchester's he never would have found himself trapped and speaking to her, without enough power to hurt her. He would not give up the experiences he had to undo the mistakes he had made. The mistakes had not been caused by his friends.
"Not like this, I've been trying to hide from other angels but I guess I don't have to worry about that now. I've also been more focused on food. How do they manage the constant hunger?"