Regrets? I'm not sure there are things that I regret. When you say "regret", do you mean a choice you made or something you did, and you think about it today, and it makes you sad or angry? I can't really say that I've had any of those experiences.
A lot of people tried to get me to do things during high school that I just simply didn't want to do--namely sex and drinking alcohol. I did neither throughout high school. Last summer I drank a little bit, and I just wasn't in to it. I sometimes wonder if I should have done things different. Would I have had more friends? Would those friends be as good as the ones I have now? I don't know, and I really don't care. I made those choices because thats what I wanted to do and it's how I feel. But that is one of the biggest choices I made in my life.
Other than that, I don't think I regret many things. I sometimes wish I would have studied harder my first semester of college. I don't dwell on it. I don't think about it and wonder "what could have been".
I look at bad decisions as learning experiences. I think it is almost impossible for others to learn from someone else's mistake. They must learn on their own, first hand. Otherwise, they don't really learn anything.