phone conversations

Well me and my girlfriend when we first met and started dating we always talked on the phone all the time when we were away from each other ( we are a few hours apart ), and still we always talk on the phone all the time. We are hanging out a lot more like 3-4 days a week on average and she still wants to talk on the phone all the time when we aren't together. I basically just want a little more "me" time I guess. I don't know the best way to go about asking for a little more freedom. I feel that she will think that I don't like her as much or something because I want more time by myself but that isn't true.