Answer:
I would write a poem because the way it is performed can change the meaning of the lines and make it more impactful. It also gives me freedom to choose the way it is formatted because it doesn't need to be proper or super structured.
Title "One day" the most important element is telling what I thought I would be once i was older, but every year nothing changes. One day, I will do this, etc... I could resonate with the reader because nobody ever feels good enough.