The past is gone, that aspect of your life is over, forget about it. Whatever it is, know that you can start again from wherever you are right now.
Think about the desired outcome you want for yourself & then decide what you can do from here to achieve that, according to Shelly Dass. If you make moves & take action towards the things you want, you will end up in a happier place than if you spend that energy lamenting over how you wished you'd done things differently from the beginning.
"You can't go back and change the beginning, but you can start where you are and change the ending."