Yes. They are going to have to prove you new the drugs were in the car. Hire an attorney.
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From your fact scenario, there is a lot to work with to form a defense. Hire the lawyer of your choice. A conviction of misdemeanor marijuana will have immediate (loss of driver license, incarceration, etc.) and possible future consequences if arrested again for marijuana (you will be charged with a felony despite fact you were just arrested for misdemeanor marijuana). You don't want a conviction of marihuana on your record. Also, if you are between the age of 18 and 21, you are eligible to apply for treatment as a Youthful Offender.
As always, no attorney/client relationship is created by this answer and I recommend that you contact a local, experienced criminal defense lawyer to discuss your particular situation.
You definitely need to hire an attorney to help you fight this.
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