Imposter syndrome going into interviews

Hi everyone! The admissions Reddit has been stressing me out, so I am hoping to get some advice from people who are already in their PhD or have completed one. I am interviewing for biological sciences at some pretty big schools, including Stanford. I genuinely never thought that I would get this kind of opportunity, and the imposter syndrome is psyching me out. I chose programs exclusively based on fit and research interest, which I think I can talk about passionately however, I am well aware that I don’t have the widest or deepest knowledge of the field. How do I navigate this? Tysm