My theory, in case you're stuck with it too.
"A result of social conditioning during your most vulnerable childhood years, in which you are taught that your value is decided by others, such as peers, parents and teachers. You now live to please others instead of searching for your own happiness."
Break the cycle!
Just thought I'd share. Mental conditioning is hard to break. Remember when you were a careless, free-thinking child? That's your natural state! Not the life of obedience and servitude!