I would say that I'm overall happy with where I'm at in life, or at least more or less content.  That said, there's definitely some stuff in the past I would do differently if I had the chance.  It seems like time travel probably isn't possible, but it would be really cool if I had a "What if" machine.  I'd love to just go back to different points in the past and see what would have happened if I had made a different decision.  They always say hindsight is 20/20, but in reality making different decisions would lead to new situations, which you didn't encounter but which you could also possibly screw up.  Some alternative roads might have been better in the short run, but worse in the long run, but you'll never know.  Unless you had a "What if" machine.  I'm telling you, that would be totally awesome.