Some people know from the time they're children what they want to be when they grow up. More power to them. Most of us don't. We might love our jobs, but we could just have easily ended up in some other field. So rather than searching for your true calling, why not pay attention to the interests that are calling out to you right now?
The same goes for soul mates. How many potentially wonderful relationships do people not pursue because they're looking for one specific person out of 6.6 billion?