Switching midwives

So I'm 30 weeks right now and the entire time I've been seeing the midwives I've had a different one every time, and now I have gotten a midwife that is supposed to be there during birth and I'm not comfortable with her. I don't feel like explaining why but I'm not being treated the same as other patients and I feel uncomfortable with her being there for the birth. Would it be rude of me to ask to switch midwives? Based on how she has been treating me I don't really want her to be at the birth. I feel like an asshole but at the same time I feel like I have a valid reason to ask to switch.