Not childish, on the contrary: quite mature, accurate, articulate and insightful.
Mostly we fear ourselves, what we are, what we aren't, etc. Whether the dialogue is accurate or not, well, that's up to us individually, and so is what we do with it.
Situations and experiences can hold a mirror up to us - so to speak - wherein we're forced to confront these fears of ourselves. It's interesting that the Steve persona did that to you. I doubt it was intentional on his part, just part of who he was, a part of the legacy he had created and you.
Mostly we fear ourselves, what we are, what we aren't, etc. Whether the dialogue is accurate or not, well, that's up to us individually, and so is what we do with it.
Situations and experiences can hold a mirror up to us - so to speak - wherein we're forced to confront these fears of ourselves. It's interesting that the Steve persona did that to you. I doubt it was intentional on his part, just part of who he was, a part of the legacy he had created and you.