It is hard to compare one country to another because they are different in so many ways. Each has positives and negatives.
Clearly the USA and Bangladesh are different. Comparing their GDP is simplistic and doesn't really speak to quality of life in either place. Much less does it take into account that two people in each country may in turn have vastly different quality of lives.
In short, using national statistics tells us very little about your life, or my life, or any specific persons life.