What can i do to get out of this poss. of marijuana charge?

alright so i was at a party in town with maybe 9 other kids there. one person was 18 and everyone else was like my age, which is 17. well the cops came in the house cause someone called them,neighbors probably. well they found a little weed, maybe like a dime or less/more. the cops told us if no one confessed then all of us would get both tickets. well i confessed to the jeger bottle and my friend confessed for the other bottles. so me and her were the only to get minor in poss. of alcohol tickets. well one friend fessed up to some of the weed but the cops said someone else had to confess to it too or we were all getting the ticket. no one said a word obviously. great friends huh. well none of the weed was on me and it wasn't my house. i wasn't even sitting anywhere near it. but i still got the ticket. so how do i convince the judge that it wasn't mine because i really didn't pay for any of it or bring any to the party. im hoping that the judge realizes that i was honest because i confessed to the alcohol. any smart person should see that if i fessed up for what was mine to save other peoples ***'s then if it was my weed i would've confessed to it. but it wasn't so im not taking the blame for it. any help about my situation would be very helpful :)