My parents used to let us have about a half a glass of wine with holiday dinners. The Thanksgiving I was 12, my parents were arguing about something at the table. At this point, we knew they were splitting up, my mom was just waiting until she found an apartment she could afford before she moved out. While they argued, I finished my wine...and then I poured another glass, and then I think another. They didn't notice. I remember getting up from the table and feeling kind of dizzy and then just laying on the sofa watching TV, feeling weird.
After that, I didn't drink again (even a half glass of wine at special dinners no longer appealed to me after that) until I was 17, at a party with my friends, at which time wine coolers became my drink of choice. A couple times I drank to the point of being really drunk, but quickly decided I didn't like how that felt. I drank fairly regularly from then on, at least during the summers when I was with my friends. Now, I rarely drink....a couple times a year maybe, and never to get drunk.