I had a terrible experience during my senior practicum. Both of my nurse preceptors were unhappy about having a student and made it clear to me on a daily basis that I was in their way. I dreaded going to clinicals every day, but I survived. It is still fresh in my mind, and now I try really hard to be kind and welcoming to the students I get to work with. I'm told by the instructors that the students fight over who gets to work with me because I'm their favorite. Makes me feel great! Sorry you're having such a tough experience. Power through and use this experience to be a better preceptor to your students in the future. Good luck!