No, not everyone in America thinks they're a superstar. The perception of oneself as a superstar or an exceptional individual varies from person to person and is not determined by nationality or geographic location.
In any country, including the United States, people have diverse personalities, beliefs, and levels of confidence. Some individuals may have a strong sense of self-esteem and consider themselves to be exceptional or talented in certain areas, while others may be more modest and humble about their abilities.
Cultural factors, societal norms, and personal experiences can influence how people view themselves and their abilities. While some Americans may be more inclined to celebrate individual success and achievement, it's essential to remember that self-perceptions differ widely among the population. The notion that everyone in America thinks they're a superstar is a stereotype and not representative of the entire population.