There is no reason to lack confidence standing at somebody's door. It would be best if you stood with pride. You know how much value you are bringing to their home. Suppose you had the mentality that you might be bothering or annoying people; switch that thinking, and switch to thinking about offering value. In that case, it is possible that your prospect didn't realize how valuable their home was. Or maybe they needed to find out how much prices were going up in their neighborhood.

You can not assume that they don't want to see this information. It would help if you guessed the opposite. Remind yourself that you were always providing value. Approach every door from this perspective; you won't feel as nervous when confident about your value. What I mean by this is that you are offering value to this neighborhood by sharing your real estate expertise. Even if they don't want to list, any homeowner who meets you at the door is gaining valuable information about the value of their home. They're also learning about market values in their neighborhood. By meeting you, they get to know their area better. They have an expert standing at their doorstep, someone they can use to add value to their life.