You need to do more than what you are paid to do. More than what is expected of you. You need to do what no one could pay you to do. You need to be excited and passionate about it. You must be willing to dedicate your time energy and money. You need to believe in it and love it. It does not have to be easy, but it must to be worth it.
Then you know have found not merely a career, but a calling.
refuse to just let it pass you by.