https://www.psychologytoday.com/intl/blog/of-prisons-and-pathos/202107/the-parentified-child-in-adulthood

Anxiety remains a highly common feature of the experiences of parentified children, as they were faced with understanding and managing difficulties too complex for their developmental levels and thus typically developed a sense that the world was difficult and dangerous, and that no one else would be able to provide support or help, thus resulting in a sense of fear, isolation, and helplessness.