How much? If it was enough to become (slightly) intoxicated, then take a nap... If it was only a mouthful then do nothing.... You won't be able to tell unless you can smell it on your breath or you're acting drunk... Or if they notice a beers missing.
It's okay.... It's not like if someone under 21 drinks beer they're going to die or something.... the only reason it's illegal is because the government believes that children are not mature enough to handle alcohol and they will end up hurting themselves or others. Also it jacks up your body (IF YOU DRINK 4 BOTTLES A DAY, which you don't) you will be fine. Next time please make sure that your coke is COKE and not BEER
atleast now you can say you know what you're talking about when someone asks if you've ever drank before...... but no, no need to panic. One ca wont kill you, just dont make it a habit and DONT Drink. well atleast i wont ever. but yea, you'll be ok. just wait for it to go/pass by, you'll be fine after a while.
No big deal, I've been drinking hard liquor sips since I was a baby, it's no problem. Just don't say anything and you wont get in troble. Im 14, and a girl. Plus beer is like 1 % alchahol. Just keep calm, you only drank a sip. ;))))