For the drinking I was trying to prove to myself that I could wait til I was 21 to drink. My parents accused me of drinking nonstop. Didn't care to smoke anything. Still haven't ever done any drugs. Considering it nowadays, though, just to try it.
As for fucking...well....no one wanted me then just like no one wants me now. I didn't weasel my way into the bedroom until I was in college, and it was short lived, it seems.