I think a lot of people are self-centered because of the society we live in. These days, there's a big focus on individual success and personal achievements. Social media also plays a role, as it encourages people to promote themselves and their lifestyles. Plus, consumer culture pushes the idea that having more stuff is better, which can make people more focused on themselves.

Some people are self-centered because of psychological reasons. For example, if someone lacks empathy or emotional intelligence, they might not understand or care about others' feelings. Also, people with low self-esteem might focus on themselves to feel better. Sometimes, self-centered behavior is a personality trait, like narcissism.

Environmental and upbringing factors can also lead to self-centered behavior. For instance, if someone grows up with overprotective or indulgent parents, they might not learn to consider others. Also, if they're not exposed to different perspectives, they might not understand the importance of empathy. Growing up in competitive environments can also make people prioritize their own interests over others.