What is a person with a strong sense of boundaries?

People who don't like too much contact with others. Specifically, a strong sense of boundaries means that this person attaches great importance to personal privacy and independence, does not easily disclose personal information to the outside world, and is more rigorous in planning time and space, and is unwilling to put himself in a passive state. From a social point of view, people with a strong sense of boundaries find it difficult to establish close relationships with others and often show loneliness and discomfort. This situation may be caused by personal personality characteristics, beliefs, cultural background or other reasons. Whatever the reason, this state may affect a person's quality of life and happiness.