I'm still in denial...I'm going to insist I'm "19 and a bit"
even when it's my birthday*. That is until I actually turn
21.
*One month minus-a-day away
I've had my modicum of fun, I took my chances to do interesting
jobs, and developed my talents...while doing well enough
academically. I dare say I don't have any regrets. 
What was it like for you?