At the beginning of last semester, I was feeling exactly what you are describing. I felt like at any moment someone would come along, declare they made a mistake in accepting me, and kick me out of school. I just wasn't feeling good enough, even though I wasn't near failing. The feeling isn't entirely gone, and I'm sure it will come back with a vengeance when clinics hit, but it did get a little better for me as time continued on and I got settled in to vet school and the course-load associated with it. The adcoms (for the most part) know what they are doing. You were accepted for a reason, and though it doesn't feel like it, you can make it through. That being said, one piece of advice that stuck with me from the beginning of the semester was to reach out for help if you need it. Most (if not all) vet schools have fantastic support systems, and have several mechanisms in place if you start to slip academically (For example, at my school if you got below a 70 on your first anatomy exam you were required to talk to the main professor about study habits and what might have gone wrong). If you are starting to fall behind, or are confused or worried about something (and it doesn't have to be school related), don't be afraid to talk to a professor, counselor, classmate, you name it. They are all there for you, and they sincerely want you to succeed, so don't be hesitant to reach out to someone if you need to.