I need some help please!!

So I have been in private school all my life and I had to move schools recently and everyone in the grade are very exclusive and I don’t fit in because they only talk about their fancy stuff. I am also the only person who didn’t go to the same school as they did so they have known each other for a long time. I have a choice if I want to transfer to a large high school and I don’t know what to do!! I really want to but Im afraid I won’t fit in.