NEVER!!!! The only thing ruining UR future is what you do today! Are there things I wish I did differently. Absolutely. But it gives me the tools to be a better person today and more importantly tomorrow.
Well if your talking about that prison term, I can understand your regrets especially if you have register as a sex offender ! So I guess it depends just exactly what it is you want to change. You can always look at it differently and just count your blessings. There's nothing I regret, I was blessed with some common sense anyway.