You've asked some important and thought-provoking questions....

Does it feel like success or is there regret or guilt, maybe self loathing to achieve what one cannot actually perform? How does one feel to be rewarded and celebrated for bravery and heroisms that were not their own, to be thanked for kindness and generosity that they did not perform, and accept the gratitude? How does it feel to build a life upon such falsehoods knowing the lie? Like winning?

In response to the above, I would say that it will only leave the person empty, if he/she is appealed to conscience.

If a lie leads to action, that action becomes a part of reality and can make what was false, true.

Although, it's hard to separate truth from falsehood after an action has been taken and reality created, it should be known that one we will still face the perils of some realities.

A fool thinks himself to be wise, but a wise man knows himself to be a fool.

I guess the above is one of the premises people build on when they try to prove that morality is subjective or relative. However, I still believe that there's something called conscience which is above morality.

Well done @tarazkp for this amazing piece, I learnt a lot.