just know that a lot of them feel exactly the same way! my favorite little story about this is 1st week of anatomy, my group of 4 was going around naming all the little parts and processes etc on the bones and here i am sitting there thinking oh my gosh, how do they already know all this? how are they already this far ahead? i'm still stuck on directional terms!!! and yet at the end of the semester, i know i ended up doing better in the class than they did (and i was terrible at anatomy!), and when we'd go over things together later, things would be shakier and less concrete as they first seemed.
will you always have people that dont need to study much, can ace every exam, and party all the time? absolutely. but most of your classmates are working very hard to put up the image that they are like the smarty pants top few.
i watched shock and relief flood the faces of the new first years a couple of weeks ago when they were asking me questions about anatomy and i joked that for the first 3 weeks i came home every night and cried about anatomy and it was a pouring out of ME TOO!! they were so relieved to hear that someone had survived anatomy with those feelings and to discover that their classmates were feeling the same way (i thought one of the girls was going to cry right then and there she was so stressed out about the course already!)
also, my first semester, coming away from an exam you would think that most to all of the class got As on every exam the way a certain few would boast. yet, when you looked at averages and such, that was not the case!
focus on your work and how you are doing, because at the end of the day you're answering to your knowledge bank as a veterinarian. you were smart enough to get where you are, you're smart enough and capable enough of getting through. vet school is hard!! it has the tendency to eat your soul, make you want to cry, steal your common sense, and make you just a tad bit more crazy than you were in the first place. but the great thing is that everyone is suffering right along side you, even if they're pretending like they aren't.