You are responsible for your problems. You are not at fault for (some of) your problems, but you are responsible for all of them.
When you decide to claim responsibility for everything that you don’t like in your life—the annoying coworker, your inability to focus, how busy you are—you give yourself the power to do something about it. I don’t care that you didn’t create these issues. Stop playing the victim card, and do something about it.