Craving...
And I don't mean food. Have you ever craved or wished you had something, yet wondered if you'd ever attain it? Have you wondered if your fight to get it or attain it would burn the shit out of you in the end? Yet at the end you'd be happy? Have you ever had those scary thoughts of it never working out and that your hard work would go to waste?
Have you looked at others with it, and wished you were in their position? And then wondered how much they probably worked at it, or didn't for the matter to attain it? Yah....that's me