Every state has different laws.
Most states I have been in is everything under 8onces meaning 7oz's and 27grams is a MM.(81.75$ USD Fine and maybe a day in jail really think the jail depends on the attitude you have).
Everything over 8onces is a Felony then your looking at time.
Check state laws.


EDIT: Didnt see that you were 16 in that case unless you have a ton of it they will just take ur shit and take you home and prolly tell your Guardians.