I think one of the most detrimental things one can do is identify with their career. I find so many people who do identify with their career. When they lose a job, when they retire, they lose their sense of identity.
When one thinks in terms of oneself as how one sells one’s labor, one is really doing a disservice to oneself. It also makes one extremely vulnerable in that it makes one less flexible. Flexibility, as Jonathan Lear argues in Radical Hope, should be the virtue one aims for in our society. Flexibility gives one the ability to reach beyond one’s current or past way of life and imagine something new and different. It’s the key virtue that lends itself to creativity and imagination in forms of life.
Of course, there’s advantages for your employer for you to identify with your career. If you are so invested in your career that you wholly identify with it, you make a good cog in the working machine. The problem, for you, is: what if the machine stops working or changes direction? What if you have to change careers or forms of life for some reason? When that happens, as it has been known to do, you will suffer an identity crisis. Instead of being able to knuckle down and move on with a different form of life–reaching for different thick concepts–you will be stuck in your old way of thinking while the world moves on without you.
So, do not place your identity in your career.