Are you a born writer? Were you put on earth to be a painter, a scientist, an apostle of peace? In the end the question can only be answered by action. Do it or don't do it. It may help to think of it this way. If you were meant to cure cancer or write a symphony or crack cold fusion and you don't do it, you not only hurt yourself, even destroy yourself,. You hurt your children. You hurt me. You hurt the planet. You shame the angels who watch over you and you spite the Almighty, who created you and only you with your unique gifts, for the sole purpose of nudging the human race one millimeter farther along its path back to God. Creative work is not a selfish act or a bid for attention on the part of the actor. It's a gift to the world and every being in it. Don't cheat us of your contribution. Give us what you've got.
... None of us are born as passive generic blobs waiting for the world to stamp its imprint on us. Instead we show up possessing already a highly refined and individuated soul. Another way of thinking of it is: We're not born with unlimited choices. We can't be anything we want to be. We come into this world with a specific, personal destiny. We have a job to do, a calling to enact, a self to become. We are who we are from the cradle, and we're stuck with it. Our job in this lifetime is not to shape ourselves into some ideal we imagine we ought to be, but to find out who we already are and become it.
Fear is good. Like self-doubt, fear is an indicator. Fear tells us what we have to do. Remember our rule of thumb: The more scared we are of a work or calling, the more sure we can be that we have to do it. Resistance is experienced as fear; the degree of fear equates to the strength of Resistance. Therefore the more fear we feel about a specific enterprise, the more certain we can be that that enterprise is important to us and to the growth of our soul. That's why we feel so much Resistance. If it meant nothing to us, there'd be no Resistance.