Psychologists call it "thin slicing."
Within moments of meeting you, people decide all sorts of things about you, from status to intelligence to conscientiousness.
Career experts say it takes just three seconds for someone to determine whether they like you and want to do business with you.
Fortunately, you have some control over the way others see you. For example, wearing tailored clothes and looking your conversation partner in the eye will generally create a more positive impression. But as for how aggressive you seem? That's largely determined by your facial structure.