Knowing what your specific mission is in life is a great consolation. You know exactly what you are supposed to do for the Lord, not a moment of your time is wasted on earth. It's a beautiful feeling of satisfaction. If you are not quite sure what your mission is yet, just pray humbly to the Lord about it. I definitely recommend seeking to attain union with God first, through the Holy Eucharist if you are a Catholic. It may take some time for it to become crystal clear to you. But when he reveals it to you, your life is filled with purpose.