Kilroy J. Oldster said this quote
“ Regret comes in four tones that operate in unison to shape our lives. First, we regret the life that we lived, the decisions we made, the words we said in anger, and enduring the shame wrought from experiencing painful failures in work and love. Secondly, we regret the life we did not live, the opportunities missed, the adventures postponed indefinitely, and the failure to become someone else other than whom we now are. American author Shannon L. Alder said, ‘One of the greatest regrets in life is being what others would want you to be, rather than being yourself.’ Third, we regret that parts of our life are over; we hang onto nostalgic feelings for the past. When we were young and happy, everything was new, and we had not yet encountered hardship. As we age and encounter painful setbacks, we experience disillusionment and can no longer envision a joyous future. Fourth, we experience bitterness because the world did not prove to be what we hoped or expected it would be. ”