I don't really agree that the title says it all, who you are and what kind of job you have are two very different things. It's actually a bit sad how we as a society tie in identity with what we do for a living. Now, my job wasn't something I would have initially have chosen, in fact, I was dead set against working in the health sector. But life took a funny turn and this is where I ended up - I do enjoy the job, I love my boss, my colleagues and the impact I have on people's lives, however, my job isn't who I am. It isn't even a contributing factor to who I am.
If I could do it all again, I simply wouldn't focus on the job, because the other things, the things you take for granted that truly matters. I wouldn't want to make huge wads of cash, only to be too busy to enjoy it. I wouldn't want to turn my favorite hobbies into a job, because experience has taught me that doing so tends to suck the fun out of it. Sure, there are probably other professions I could have enjoyed, but as I'm comfortable where I am, why would I want to jeopardise that, when what matters the most to me is what happens the rest of the time?
I don't need to publish a book in order to write and share my stories with the world. I don't need a client in order to tinker around with code and design, in fact, I prefer not to have one. I'm more fond of the creative side of video editing than what probably is the day to day for most of them, also my skills, while decent for a hobby-artist, really aren't up to par with what the profession would demand of me. Simply put, I'd rather do these things impulsively on my spare time than try and make a career out of it.