The true meaning of "angst"

The definition of "angst" as found in The Urban Dictionary (www.urbandictionary.com)

"Angst, often confused with anxiety, is a transcendent emotion in that it combines the unbearable anguish of life with the hopes of overcoming this seemingly impossible situation. Without the important element of hope, then the emotion is anxiety, not angst. Angst denotes the constant struggle one has with the burdens of life that weighs on the dispossessed and not knowing when the salvation will appear." The definition of "angst" as found in my life (otherwise known as "the true meaning ...") "What if I run out of time to learn all of the lessons I'm meant to learn in this life time?"