One of the most clear signs of one's calling is something that has interested you or has constantly been a part of your life in a positive way since you were a child. A calling is more about others than about you; it's a service you do to get others closer to God (directly or indirectly) to glorify God.
It is important that we realize our calling because it will help us to go further in being successful in it, thereby praising God more.
It can become an "obsession" in a negative way if we feel saddened, very anxious, depressed, etc...any negative kind of feeling about finding out what our calling is. Just pray for a better understanding of your calling if you feel those things, and have faith that God will reveal more to you about your calling.
In the meantime, continue to do positive service(s)--it could be more than one!--that you are most interested in that helps people get to know God. Who knows? Maybe that is (or those are) actually your calling.
Read more about one's calling here:
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