How do I know what life choices God is calling me to?

You must pray every day, asking God to reveal His plan for you.  Do not ask yourself, "What do I want to do with my life?” or “What do I want to become."  These are the wrong questions!  Rather, you should be thinking and asking: "Jesus, what do you want me to be?”  or “How do you want me to love You?"  And listen for the answer!  Listen with your heart, not just your head.