Is AUTHOR wrong in the post ? POST : Hi, so another school post. INFO: 15, F. In a releationship with a guy. 
Girl: 14, single. Grade below

Every year, we have 3 dances; homecoming, snow fest, and prom. Only two are available for 7th-12th, prom is 11th-12th and 10th if invited. Homecoming passed, now its snow fest's turn. She asked me to snow fest and I said, "Just as friends." She frowned and I said it again "Just. As. Friends." And she grinned as her brother quotes "A creep smirk"

I didn't mind, but she bought me a Valentine's day card the school gives out each year. It was "I love you everything you DEW" with a Mountain Dew and a cherry sucker. She drew me on the back, but my head was gone and had a creepy shadow behind me. So, would I be the asshole for changing my mind because im uncomfortable and dont have any romantic interest in her.

WIBTA If I change my mind because I am uncomfortable and feel like she doesnt understand that I dont like her romantically?