First of all CONGRATULATIONS TO YOUR MOM! I applaud her for calling the police and having you charged.
Second of all, Minnesota has teen courts:
A new kind of justice is taking place in many Minnesota communities. Youth who commit minor offenses such as petty theft, possession of alcohol, smoking or disorderly conduct, or who violate school rules are receiving consequences for their behavior not from the juvenile court system or a school disciplinary board but from a "jury" of their peers in teen court. Law enforcement and probation officers, teachers and others may refer youth to these voluntary programs operated in locations such as schools, nonprofit organizations, probation agencies and police departments. To participate, the youth must admit to having committed the offense. In most situations, successful completion of the program means that the youth will not have a juvenile record or, in the case of a school referral, will not be suspended or expelled. Aside from offenders, other youth may volunteer to fill such roles as juror or attorney. The function of the jury is to listen to the circumstances surrounding the offense and determine what consequence the youthful offender should receive as a result. Consequences include community service, writing essays related to the infraction, completing a counseling, treatment or educational program, apologizing to the victim, or participating as a juror in subsequent teen court cases.
You might see if this is available in your community and if you are willing to admit to the fact that you broke the law then go through whatever they tell you to do.Underage consumption is normally up to 90 days in jail and a fine ranging between $100 to $700.
Expect to end up getting a job because if your mom called the police then I do not see her bailing your butt out of this predicament but rather I expect that she would want you to pay your own darn fines.
Oh and realize that mom may be even harsher by not allowing you to get a driver's license while you live with her and what not. Again good for your mom for doing this!