Competition
The people running the same race as you
Knowing who is competing with you, and what you actually think about that, is more useful than ignoring competition or being preoccupied with it.
Competition in professional life is real, even when people pretend otherwise. There are limited positions, limited attention, limited clients. People are going after some of the same things you are going after. How you relate to that fact affects both your strategy and your state of mind.
The most useful thing competition can do is sharpen your sense of what makes you distinct. When you look at the people running the same race, what do you have that they do not? What angle are they taking that you have not considered? Where is there genuinely room for everyone, and where is the field genuinely crowded?
Competition also has an emotional dimension that is worth naming. Envy, admiration, anxiety, and inspiration can all come from watching others. Being honest about what you feel when you look at your competitors, rather than performing indifference, tends to be more useful than pretending those feelings are not there.