Up until about the late 20s, I did very few things wrong or made any decisions that I would change much now.
However, since that time, I have rapidly started making quite a lot miscalculations, especially in terms of career moves. I am now pretty unhappy with my situation, though it is not too bad and it can get and most likely will get worse (and fairly soon). Moreover, the bad decisions is stuff that undermines a lot of sustained effort, so I feel pretty spiteful and futile. I have made at least 3 major decisions over the last few years that I would definitely change if I could, and now my life is getting quite unpleasant.
Anyone else feels like this and what are your thoughts?