i'm not going to try to be the morality police... you can do what you want.
you will be fucked even more if you get pulled over with a suspended liscense, but if that's what you want to do, go nuts. just study the consequences fully before you do, and if you still think it's worth it, then... again... go nuts.
as for the cop... he's really just doing his job.
i got cuffed up for underage drinking twice when i was at college, so i'm certainly not going to tell you to stop drinking underage. you can do what you want. the one time i was just stupid... first night of school and i decide to whip out a beer on a busy street and drink it... big mistake. the second time i was at a party, trying to be "responsible" and the cops raided the party because it was apparently too loud and a few neighbors complained. small town college, small town cops with nothing better to do. took me down to the station and this time let me go without giving me a ticket.
did i stop drinking for the month left between the second time and my 21st birthday? lol... yea right. and i would imagine you won't stop either. but as annoying as it might have been, i was, and you are, still technicaly breaking the law... so it's not the cops fault.
and if you are outside the house, they don't need a reason to approach you, and once they approach you they could smell the alcohol, and that's all the reason they need to arrest you.