The concept of a vocation is a fairly recent invention, mostly arising out of the Protestant brand of Christianity. Work has been disdained throughout most of history [1]. Therefore, I would say that liking your work or finding your calling are not things that everyone can even do or has to do. The idea of a vocation strikes me more as intellectual rationalizations arising in tandem with the current economic mode of life.

[1] http://www.amazon.com/The-History-Work-Richard-Donkin/dp/023...