You may find, later when you're on the floor as an RN, that what seems mean or unhelpful is really just a nurse trying to get all his/her own stuff done in the short 8 or 12 hours (s)he has. Ive rarely met nurses who WANT to be b**chy to students, it's more a matter of time, even when I was a student.
That said, try and get oriented to your unit in the first day or two. Where is dirty utility, med room, etc and write down their access codes if they have one. One less thing to ask, at any rate.
If you have a clinical question, try and formulate what you know before you ask. For instance, you could say, "I have to give ativan IM, how much should I dilute it before I give it, do we have a policy?" Rather than, "oh my God, how do I give ativan IM?" The way you ask may make a difference.
Also, never hurts to grovel a little bit, however much is makes you want to choke. Start with "I know you're busy and I HATE to bother you but would you mind helping me set this IV pump, it's new to me." The nursing student who "knows it all" does'nt go over well. Nurses on the floor know that nursing school mostly teaches you how to later learn to be a nurse. The real education comes after you have that RN after your name.
Your instructor isn't always handy and I know you have to ask other nurses. That said, please remember that even if a nurse helps you out (and say THANK YOU please), you may need your instructor present to do a skill like giving an IM injection. Never go around your instructor, trust me on this.
At the end of the day, nursing school is full of challenges. Grow a tough skin and remember it's likely NOT you personally, but simply the difficulty of being interrupted when a nurse has just got herself organized for her own day.
This is actually a good topic for your post-conference. Discuss with your instructor and clinical group the best methods of meeting your learning needs on a busy floor with nurses who are really doing a (tough) job - your instructor likely has "been there done that" from a floor nurse perspective, and may be able to give you some good pointers.