Authenticity is everything! You have to wake up every day and look in the mirror, and you want to be proud of the person who's looking back at you. And you can only do that if you're being honest with yourself and being a person of high character. You have an opportunity every single day to write that story of your life.
You can't connect the dots looking forward; you can only connect them looking backwards. So you have to trust that the dots will somehow connect in your future. You have to trust in something - your gut, destiny, life, karma, whatever. This approach has never let me down, and it has made all the difference in my life.
Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle. As with all matters of the heart, you'll know when you find it.