No, not everyone in America thinks they are a superstar. Like any other country, the United States is a diverse and varied nation with a wide range of individuals, each with their own unique beliefs, attitudes, and self-perceptions.
While it's true that some people in any country, including the United States, may have an inflated sense of self-importance or believe they are exceptional in some way, it would be inaccurate and unfair to make such a generalization about an entire population. Many Americans are humble, down-to-earth, and have realistic views of themselves and their abilities.
The perception that "everyone in America thinks they're a superstar" may be influenced by certain cultural aspects, such as the American emphasis on individualism, self-promotion, and ambition. In a society that celebrates success and achievement, some individuals may be more vocal about their accomplishments, leading to a stereotype of overconfidence.
It is essential to remember that individual behavior and attitudes can vary significantly, and making sweeping generalizations about any group of people, including Americans, can perpetuate stereotypes and misconceptions. Just like anywhere else in the world, the personalities and self-perceptions of individuals in the United States are diverse and multifaceted.