Actually, your style is good and style is an important part of writing. Just rewrite, rewrite, rewrite. And practice writing. To improve your story, read it, perhaps aloud, to get a feel of what sounds off. Though it's easier and quicker to read with our "inner ear", only a combination of our inner and outer ears can proofread correctly. So, read it aloud. What help your story needs is something you have to take care of. To be poetic, your story is your painting; no editor or proofreader other than yourself can improve your art without staining it with their signature stroke.
So, I'm being redundant (I'm sorry

) but the gist of it is you're doing good. All writers, whether their manuscript is twenty years old, can still improve. Good luck.