What will happen to me when getting pulled over and failing a sobriety test with a .74?

i was in the passenger seat of another car. i blacked out and the driver of the car i was in had told a 15 year old to drive my car back home. he got pulled over and so did we. the officer pulled me out of the car and gave me a sobriety test i failed with a .74. he gave me a ticket for giving the minor permission to drive my car ( which i never did because i was blacked out). the officer then arrested me and gave me a court date for being intoxicated in public and being under age. what should i do and what will most likely happen to me?