How do I fight the ticket I got for minor possession of alcohol and possession of marijuana?

Hi. I'm 16 and two months ago, I got a ticket for "minor possession of alcohol" and "possession of marijuana". They wrote it under a traffic ticket since they found me laying on my sidewalk sleeping. I do not remember anything from that night but they did search my car finding 3 empty alcohol bottles and the marijuana was in my purse NOT in my car. I have a provisional license. Out of two of the cops that gave me this ticket, one was my best friend's mom's boyfriend who has hated me for a long time. He always would say rude things in the past. Since he knew me, he had the other police write the ticket. Why couldn't he have just woken me up and told me to go inside? My car was in my drive way and I was not in it when this happened. The cop I know has told others that are not police that have confronted me about it. I don't want to get my license taken away. It was a dumb mistake that I have made and I have been going to outtake rehab once a week ever since. They also sent me a yellow paper in the mail a month after it saying that they want to change the date and time but I will be notified when they do. Another month has passed and I've been having so much stress. It's also holding me back from getting a car for myself since the vehicle I got this ticket for was my dad's.