To me, self-driven means that you have personal goals and drives that you are striving to achieve, that you are not just driven because you have to do work or because you want to reach a specific goal related to your work, but because you have a passion, a drive, and a want and a need to strive for greatness, and that you are able to push yourself to do better things, as opposed to being told that you need to meet a goal or a deadline, and instead that you want to do those things, and that you're always looking to better yourself, your skills, you're always looking for feedback from others so that you can grow and improve.