I think the problem with reasonable and societally-accepted behavior is that we train ourselves to pursue planned paths and stable foundations. As a result, we never have the opportunity to discover and chase what makes us truly feel alive. Solution: Be unreasonable in the pursuit of your dreams.
Of course motivation is not permanent. But then, neither is bathing; but it is something you should do on a regular basis.
Nothing in the world is ever completely wrong. Even a stopped clock is right twice a day.
Do you want to know who you are? Don't ask. Act! Action will delineate and define you.