It’s not prudent for Human A to feel guilty or ashamed or sorry for themselves if someone more lucky (by the chance of lucky environmental, genetic or hereditary factors etc) has a greater degree of “apparent outwardly success” than themselves.
The downtrodden in luck, the unlucky cannot compete successfully with the lucky in most cases.
Another reason why the role of gratitude is paramount in the feelings of day to day happiness & success. We all have a reason for feeling grateful for what we have achieved with all our efforts.
All that’s one can do is to set a goal in mind and travail towards that goal, enjoying the journey in the process(because the extent and certainty or goal achievement isn’t definite), as well.
Hence, it’s more prudent to choose a journey in something that one either already enjoys or will enjoy as they work towards it.