The Stanford Prison Experiment was a fraud, please don't listen to rationale based on one unreproduced "study".

"The context of one’s life defines not just what but how one thinks, and a job tends to dominate the context of one’s life — particularly when that job is considered to be part of a career. Your job will change you."

Absolute and complete pseudoscientific bullshit. Everything in life changes you. Every. Thing. Your job, the old man that works at the fruit stand around the corner from your flat, the air you breathe. No one thing in your life is going to determine who you are, because your rational, conscious, decision-making brain is what chooses your path in life. Not some amorphous organization or position that supposedly has control over your cognitive pathways. You change you.

Go ahead and chase a career. Will your life be any better or worse than if you didn't? There is absolutely no way to know that in advance.

You know how you discover yourself? By living your life. By self-reflection, by seeking knowledge, and also by flipping a coin and walking wherever the coin leads.

"Learn three chords, start a band, and go on tour. Ride a bicycle as far as you can. Go WWOOFing or start a community garden in your neighborhood. Put together a traveling puppet show. Build a drone to engage the emerging drones controlled by domestic police. Do whatever — but make it uncomfortable (like leaving prison!) and make it count."

Or don't. It doesn't matter. You are going to become who you are going to be, no matter what you do or don't do. You don't have to be uncomfortable. Nothing you do has to "count". It can, if you want. But you don't need to live some noble life. Your life doesn't have to have meaning. You don't have to seek new experiences and become some dynamic, interesting renaissance man. It's your life.

Here's my career advice:

If you want a career, keep in mind that a career is basically a marathon, whereupon the end goal of the race is to have a high position, good pay, the respect and reference of your peers, interesting work, personal fulfillment, and a fat retirement account. If that's what you want, then most of your actions should be centered around becoming likeable, knowledgeable, useful, and constantly preparing for the next step on the path. If you do it really well, you can climb very fast, but that might work against you. If you do it poorly, you can end up not very far, without much money, or references, or prospects, when you need them the most. Careers are largely a political consideration.

That said, even with this weird political focus around work, you can still have a personal life that revolves around whatever you want outside of work. You also have a very wide latitude of what kind of work you do, where you do it, who you do it for, what its results are, how long and how hard you do it, etc. There is a very, very wide spectrum of both career, and life, and you don't have to fit into anyone's mold. You can even give birth to your own career niche.

The point of this comment, just like the point of Moxie's post, is to tell you that you have options. You can expand your horizons and do all kinds of things that you aren't aware of yet. But also know that, no matter where you go or what you do, you are still just who you are. Life doesn't get better or worse based on what you do. It's your state of mind that makes life worth living. You are not your job. You are yourself.