Even though it's easier to believe we're the victims of our circumstances, it's empowering to take ownership of how the world around us impacts our well-being. Regardless of the situation you find yourself in, I believe that you always have a choice, and there are always things within your control that you can focus on.
One should never assume that it's impossible to slow down, or that by doing so, someone is going to shame you for it. Learning to stay focused isn't going to lead you to less work, but it will certainly help you to manage stress, allow you to do more, and generally provide a smoother working experience.
You are definitely more than just a job title. Focus on the aspects of who you are that you like the most and seek to fulfill them on a daily basis. You'll feel better about yourself and your situation, and maybe you'll even develop a healthier perspective about your identity than you had when you were working full time.