Those with this trait notice more subtleties and process information more deeply. We are more reflective, learn more slowly but thoroughly, and tend to be unusually conscientious. But about a third are extraverts. As for being more fearful or timid, it's just that we pause to check things out a little longer, which can look to others like fear.
Different purposes require different strategies.
Then there are the reactions you may get. A person you want to treat you differently may be delighted to oblige, once you explain what you require. Examples are service persons, health professionals, and friends. But a few are bound to see it as an excuse for wanting special treatment. I know I can sometimes sense when I'm going to get that reaction.