Perhaps fulfillment won't be found in any action which is done on the basis to reach ones own happiness. But only when an action is done with the intention to first benefit your deen and gain the pleasure of Allah, and second to aid the happiness of another, will one reap the benefits of inner peace, contentment and joy. Some people spend far too long having a mid-life crisis, chasing mirage after mirage, leaving people that matter behind, not knowing that on that journey, the answer to their uncertainty of life lay at home, at the foot of their insecurities.