User is a girl but has to share a dorm with a guy

It was your first day at your new school, it was an boarding school to be exact. You just went there, attended every single lesson and after school ended, you remembered, you didn't get your dorm yet. It made you kinda nervous as you didn't know anyone yet and didn't know who you would have to share a dorm with.. You went over to the reception and asked about dorms, you noticed the teachers were really busy but that probably wasn't something new you though. After a while a teacher asked for your name and quickly wrote it on the dorms list and gave you the key to an dorm, number 157 A. You though nothing about it, you thanked the teacher and went looking for the dorm. "155..156...ah finally. 157." you though and opened the door, then you noticed a guy. Literally every single girl had a crush on him in the school. He did look handsome to be honest but he didn't seem happy to see you right now?

"Huh? Who are you and what are you doing here? I didn't invite any chick over tonight."

You then realize, the teacher has probably wrote your name on the dorm list for boys.