Hi, Georgia. I am glad to give your poem a review, since I am always interested in consideration of Neville's character.
Your poem is a good insight into what may have been going on inside Neville's head after the second wizarding war. A key line in your poem, "places I never wanted to go," sums up his feelings about this entire period of his life.
I am struck by the fact that this entire poem consists of his inner thoughts, which he is not revealing to anyone and which others may not suspect. It is very consistent with what we know of his character that the public adulation is uncomfortable for him to handle and feels very much at odds with his true nature.
You express this inner conflict well; an example is the line "What if I told the Truth, nothing else? I'd rather not find out."
The use of capital letters on some nouns is effective in suggesting that in Neville's mind these capitalized things are distorted or over-hyped, such as "Act of Deep Thinking" and "Important Position," to cite just a few. (However, there are a few other words, such as "shy little Boy" and "Dirt under my Fingernails," which seem to be meant straight-forwardly, and I would not have capitalized them.)
The question of how the shy little boy developed into one of the Heroes of Hogwarts is a topic of endless discussion, especially since so much of the personal development occurred "behind the scenes" during the year of book 7. Your poem suggests that the heroic role was thrust upon him and that in the aftermath he was desperate to gain control over his own life again. He wonders "how life would have been if the world had not needed rescuing."
(In line 12, I wonder if there were a couple of letters reversed, if "except" was meant to be "expect", so that the line would read "they expect some Important Position", and in the final line a word seems accidently dropped, which I took the liberty of restoring, in my previous paragraph.)
I enjoyed this poem. It seems very true; I don't recall reading much of this sentiment before, and yet Neville must have felt this way, in his quiet moments, waiting for the hoopla to die down so that he could get on with his life. Well done.