They aren't treating you different because you are an LPN, they are treating you as a new employee who also happens to be a new nurse. Nursing school
only gives us the basics, we do most of our learning on the job. Don't feel bad if you don't know everything right away. Pleasantly ask for help. A couple of ways to ask is to say, "help me understand," or "I may have been told this already yet I need to review it." Or, "what about (insert suggestion here)"
'What can I do better the next time this happens" These ways show you are very willing to learn. Experienced nurses who change jobs also have a nice learning curve.
Do your job, do the best you can do and once you gain more experience, you will be taken seriously.