The officers are not there to give legal advice, and they should NOT be telling you that.
Get your attorney, and even if the case is not dismissed outright on the basis of a questionable search, very often there is the option to sign papers admitting that there is ample evidence to convict, but the DA agrees that the case is not worth pursuing through a trial and that you will simply go on probation for a given period until it is clear that you are not a threat and the case is dismissed at the end of that time. In my state it is called 'continued without finding' and then it will say 'for a period of ___ months' and that is your probationary period where you have to keep your nose clean and prove you are not worth sending to jail or whatever. IF you DO fuck up in that time, then you have to serve the original punishment. So stay out of trouble, and what the fuck are you doing at 18 driving around with booze in your car? Bad news right there. Not safe for you or the passengers, and a bad habit to get into at your age especially.