Phillip Zimbardo, the eminent Stanford social psychologist, shares his thoughts on a meaningful life in a commencement address. I direct you to the Greater Good, which provides embedded links to research supporting his remarks.
Summarizing his thoughts:

~ Use time wisely and well.
~ Love a lifetime of learning.
~ Nurture your passions.
~ Transform shyness into social engagement.
~ Remake your image.
~ Become a positive deviant

He has tons to say for each and youtube links as well. As I’ve written in earlier posts, lists like these are guideposts and aspirational thoughts.