I got falling-down drunk on my 21st. Woke up with a hangover that lasted three days. I don't recommend this. Do something you will remember with a smile. Go hang gliding, surfing, bungee-jumping, parachuting, boating, make all your friends dress up like it's halloween, and you do it too. Go run around town letting people see you all dressed up. Knock on some doors and ask for candy, just to be funny.
I went to a tavern with family and friends and got drunk for the first time, the friends are for fun, the family it to prevent a regretful morning.
I Got drunk and had sex at my parents house in my room with everybody gone then afterward I went to work
I would do what I am doing for my 20th this year, go to a party, and drink enough alcohol to forget the entire night.