I don't know how to give advice, but I do want to try my hand at dialogue for that... hmmm... maybe like:
"You knocked into my experiment!" I shouted, embarrassed as all get out.
The girl in white clothes smiled amusedly at me, a cat-like, half-lidded stare just pressuring me into being even more flustered. She moved assuredly right up into my space, placing her hand on my shoulder.
Personal bubble, girl! You heard of it before?
"Don't worry. I already forgive you for setting near me," she said magnanimously, before frizzing up my carefully tended cornrows.
My eye twitched.
"It's a slight upon the world if you don't quickly clean your issues for me, so do so. Then wipe my shoes," she commanded as evidently as if she said the sky was blue.
"Girl... what the fuck, bitch? Who are you?" I exclaimed, looking at her with aghast askance.
Her face froze for a second, blinking for nearly ten seconds straight.
"I'm sorry. Could you repeat that question?" she asked with a befuddled tone.
"Who. Are. You?" I practically spelled out.
"I'm... me." She looked me up and down with a grimace of disbelief. Her head just shakes back and forth, her eyes squinting.
"Hahahahaha!" she chuckled deep from within her throat, literal tears of laughter falling from her light green eyes. "You are amusing. Who am I?" It appeared as if I had made her day with my apparently hilarious comedy.
My lips pulled back in a worried smile, more a baring of teeth than any shared amusement.
"Seriously though... who are you?"
"You can't be serious. I refuse to believe that a child so idiotic exists." she said, with veritable, back-breaking, tons of condescension weighing each and every syllable.
"You are literally a high school student just like me," I laugh out angrily.
"And? I am me. That should be enough to put me head and shoulders above you," she states simply, eyes still searching my face for any admiration of her.