I have a crush on a girl im 13 help plz?

Hi well im 13 years old now now in 8th grade and i had a crush on a girl since 6th grade. I dont want to ask her out cuz its middle school u know? I want to wait till im older but im nots ure what high school shes going to. Umm i was wondering whats the best way to ask her what high school shes going to. But she dosent know who i am yet havent even spoken to her xD cuz shes never been in any of my cles or ever talked to me. Well thx cya