>>33452580 (OP)The way regret works is that the more forward you move in life, newer knowledge is accumulated and incorporated; and in those lessons are better and more efficient ways of doing the previous which makes regret one of the inevitables in life no matter how set intelligent.
In one point as well, everything that came before — you did, because it was everything you ever wanted at your capacity at those times.
The terrible price for the consumption of the past is also the consumption of both present and potential futures.