Crush advice

so, i'm a 15 year old guy, and i have a HUGE crush on a girl who was in my class. Yesterday was my last day in school and she lives in a different town, so i cant talk to her in person. Luckily the most common way to communicate here is via messenger. Yesterday at the party we walked around arm in arm and we also danced for a short amount of time. We were both drunk (very drunk) In school i would pretty regularily notice her looking at me, and as soon as i looked back she would look away. We also didnt talk much, but when she did she would always seem kinda nervous. (Let it be known she is a very shy girl) i REALLY enjoyed the time me and her spent yesterday, and i want to know if she likes me, because if i knew that, i would instantly strike. I dont know how to text her because i'm scared it would be way too akward, and im really nervous the feelings arent mutual. Also because i used to have a crush on her good friend, and she knows that. Another thing, we arent going the same place after summer break, so there isnt chance for me to do it after summer. She isnt lie your typical hot girl with a bbig butt and boobs, she is different, and thats why i want her so bad. Please tell me how to text her, or how to know if she likes me back. We will maybe have an event thing in the summer for the class to properly say goodbye, but i just dont know what to do. Thank you in advance