Memories of my teens and early 20s are sprinkled with "Damn, I can't believe I did that..." moments, but every situation was a learning experience... thus shaping me into the person I am today. I think the key to understanding the concept of "regrets" is really dependent upon how long it took for you to learn whatever lesson was at hand. Did you have to date the loser 20 times to figure out he was a loser? Did it take failing numerous tests/classes to figure out your school routine wasn't working? How many jobs did you get fired from before you got your attitude in check? The list goes on and on... but for me, I've definitely tried my best to learn whatever lesson I needed to the first (or maybe second lol) time around.