It's pretty simple: Success is doing what you (or I) want to do. Doing what you want to do, all day every day, makes you successful. And we all have our own ideas of what we want (and can change them as we wish), so no one can determine anyone else's success level.

You have to ask and answer to yourself: Are you really doing what you want to do? Are you on your way? Can you see the path to getting there? Do you know when it will happen? How much control do you have over the outcomes?