RN won't give pain meds

I am an LPN in a small facility. Many docs here order Morphine IV to be given to their pts. My problem is that as an LPN I cannot give IV push meds. When my pts ask for pain med for a pain level of 5/5 I have to ask the RN to give the med for me. Sometimes they will go and look in the room and if the pts is lying there with their eyes closed waiting for someone to come in and give them relief. They will come back and say I am not giving them anything because they are sleep and don't give them anything if they can sleep. (They are not asleep because they call fifteen minutes laterasking for pain med.) If the Doc ordered 1-3mg of Morphine q2h prn. And my pt has just come from surgery and I ask if they can give the pt that I am taking care of 2mg for the breakthrough and then hopefully in three hours when they get their first scheduled po med it will cover them. They will tell me well just wait until they get their po, they just woke up they can't be in that much pain.
Am I being overly sensitive to this because I am a new nurse? Am I assessing my pts wrong when it comes to their pain? It makes me angry that I cannot be in control fully of medicating my pts when they are in pain.Am I wrong for wanting the RN to give my pt pain med when I ask or are they wrong for just assuming that my pts are not in that much pain.

By the way in this facility I work nights and most of the time we have on 4-7 pts and the RN usually has 0-2 since they have more paperwork the LPN's take on the larger pt load.