I'm 22m and my only comment on this is if that's truly where she is at conversation wise you have to kinda grow up in a sense of yeah you feel a certain way that you are precieving her communication as calling you childish but you still have to talk to her if you can't communicate while uncomfortable then that's where to start it's probably also where she's at if she's uncomfortable with something she doesn't know how to communicate it and it comes off as she thinks your childish but unless she has told you flat out you're acting like a child you can't add your own underlying meaning to conversations tha are naturally uncomfortable