Imposter syndrome

I recently graduated with my Masters in School Counseling in May and have been applying for jobs. The job market is so rough but now I’m also worried I’m just not fit for the role. I had 3 different internships during grad school but I still feel like there’s so much I don’t fully know how to do as a school counselor. I’m worried that once I get a job I won’t know what to do? I’m wondering if anyone has felt this way starting out and how did you overcome this feeling?