I think I'd work on sentence construction before wording. Heads up for rainbow edits!
deepforestchild
As I
sensed the wind behind my back
, I imagined it to be a person and the leaves I heard rolling
to be their footsteps.
I felt that instead of the wind taking me
everywhere, I was the one taking the wind somewhere.
I smiled.#1: Consistency and parallelism. If you start with "I imagined" you can't go straight into a metaphor without warning. If there's an "and" between two clauses, the verbs need to be in the same tense. If you're comparing two things and end both with a "where" it sounds better if the "where" word follows the same pattern.
#2: Commas. Know where you need them, know where you don't. Don't substitute a period for a comma. Don't have a parenthetical phrase without the proper comma(s). Don't start a sentence with "for".
#3: Miscellaneous gripes. I kind of get what you mean by feeling a smile inside, but holy cow does that feel awkward for some reason. And when you feel like smiling, you're usually smiling. So either come up with a new way of expressing that idea, or just smile on the outside. And I wouldn't use the impersonal "its" for a person when contrasting the wind with a person. Actually I just wouldn't use "it" for a person. It's impersonal.
#4: Making it longer. Hang out with wind-person for a while. Who is this person? What are they doing? Why are they following you? And then maybe come up with a way for it to lead logically to the second sentence. Right now it's just two ideas, possibly connected in time. But there's no other connection. Make one.
I kind of can't help with wording. Words, for me, are too close to the ideas they express. I can clean things up, but anything more and it won't be your work, it'll be mine.