Non, je ne regrette rien.
It is easy to think just one step ahead, but if you had set your business up earlier Rocketstop2. It might have failed, it may have ended in you being killed in a road accident because a business journey meant you were in the wrong place at the wrong time.You cannot just think one step ahead.
My life has been full of junctions where I have had to choose which route to follow. Some decisions have been right, others have been wrong, but all in all I am now over 80, and I regret nothing, much better things to do and think about to waste time on fruitless regrets.