Unless you already have lived/worked in a place where every day you have seen with your own eyes and felt with your heart the gap between 'socioeconomically privileged' and 'socioeconomically lacking,' go on at least one mission. Go as early as possible.
Use that time to discern how to make a mission of your life.
Experience how some people who lack material wealth possess amazing psychological wealth.
video courtesy of Laura Escobar, MD