The likelihood is that won't happen. There will always be people who you simply don't get along with and can make work a little difficult but you have to get on with the job and look after your patient. But I think, on the whole, you will find people are suportive.
People won't set out to make you feel bad but you have to be prepared to take criticism. Nursing is all about lifelong learning and it is a steep learning curve at the beginning. People won't want to upset you but you may find sometimes they can seem to critique harshly, but this is only if they need to step in or overide you for patient safety. They should always explain their criticisms to you. As long as you realise that its about helping you become a better nurse you'll be fine.
Additionally think of it this way. Even if there are people who are hard to get a long with (unfortuantely there are people in nursing who's personalities are not right for nursing) and seem like they are trying to make life hard for you, it is only a short placement and at the end you can leave and never go back. But the good will always outnumber the bad... and you can always tell your mentor/uni if someone is really upsetting you.
Plus, this isn't school. These will be adults you're working with. There will be bitchiness (an unfortunate truth of working with women) but any bullies will be a lot fewer and farther between than at school... most people grow out of it.
Hope that helps a little