I was struggling with the same thing when I was in the periop program for my job. It took quite a while for most of the staff to even smile back at me. However, now that I've been working there for a couple years I understand that they were just standoffish because so many of the new people don't finish orientation, quit soon after finishing, or get moved to a different OR at our hospital, and it gets frustrating to put so much effort training these new people only for them to leave.
I try to be welcoming and kind to the new staff because I remember how it felt to be new and feel like everyone hates you, but many people in the OR will make you earn their trust first. Now, the STs and RNs are my friends and we all help each other out, but it did take a while to get here. We do have to depend on each other quite a bit so maybe they just don't quite trust you yet. It takes some thick skin to work in the OR, especially with some of the surgeons yelling at you over ridiculous things, so I think the staff is also trying to prepare you for that.
My advice is to stick it out if you really like being in the OR. If you enjoy being a circulator, then just focus on learning and doing the best job you can and eventually your coworkers will come around. And if their behavior continues once you know what you're doing then get out of there! Good luck, you can do it!