There's got to be something you're passionate about in life, and if your current line of work is not amenable to it, the advice, heeded or not, is to find a new line of work.
Or if you really don't know what your passion is -- and many don't -- try some things! Particularly if you're young and single; now is the time in life you should be experimenting, unless you're one of the relative few who already know what they want to do.