The Lord has loved you into being, and since the moment of your conception He has had a plan for your life. He has created you totally unique.
There is no one else in the world quite like you, and he wanted you to be here in this world. You are not an add-on, an extra, an afterthought, or luggage in this world. You are essential, indispensable and important. Jesus Christ has created you and you alone for some specific mission, and wants to reveal it to you.
Jesus loves you so much that He invites you to help him save the world. Of course He alone is the Savior, but He opens up His life to us that we too may share in His mission of salvation. He is calling you. He is calling you to help him in his salvation of the world. This is what we mean by vocation. So the first step in discerning your vocation is to understand that God has created you out of love and in His love invites you to share in his work of saving the world.