You're right about our cultural notion of our self worth is based on our accomplishments and/or career success. Accomplishments can add to our happiness, but it's not the be all, end all to our happiness. Personally, whenever I go on Facebook and see other people's accomplishments at my age, I feel inadequate and inferior, as if I didn't try hard enough, dream hard enough, but everyone's timelines are different, as are their own paths to happiness.