He should have charged you with underage drinking, not driving without a license.... but.... if this is the worst that it gets, you're in pretty good shape.  Better to have a traffic citation on your record that an MIP charge.  Keep in mind, however, that the officer has until the statute of limitations runs to file any charges, so try to avoid any new arrests for a while.  As far as the driving while licenses suspended charge goes, you may want to hire an attorney to look into this for you.  If you had a license while you were driving, then you can't be convicted of DWLS.  You're catch 22 is, however, the officer may realize the mistake and change the charge.  So have someone look into it and how it's going to actually be charged-- but be careful not to raise to big of a stink that could backfire on you.