I doubt that there exists a person that never thought they would love to live somebody elses life.
It's inevitable to find out that there exists somebody that lives your "dream" life.
Be it that they are rich or talented or have loads of friends or a long-lasting relationship, someone out there will always seem to be ahead of you.
Now starts the self-confidence decline: "why aren't I good enough to be like him or her? "
"what did I do wrong up until now?"
"he or she is just better than me... there's no helping it, it's just the way it is... they are better and they deserve it, I don't..."
You might try to improve, if you actually manage to find out what is "wrong" with you, but how much improvement is enough? is it ever enough?
It most likely never is
And so you're stuck
Projecting your souls desires on another body.