My question involves criminal law for the state of: Washington.

hi im 17 years old and is turning into 18 on january 25th.
I got caught for shoplifting in Washington State.
the total amount of things i stole is $220. And i stole them from 4 different stores at the mall. This is my first time doing this. I was arrested and got taken pictures and fingerprints at the local police department. They said i will be attending a court.
What are the punishments for my crime? will i go to a jail?
and also if i get the court invitation letter after my birthday(jan 25th, when i turn into 18). do i get judged as an adult even though the crime was happened when i was 17?

thank you for answering