I feel that way a lot too.

I think the most useful thing anyone's ever said to me when I felt like I was making it up was, "So what if you are?" This was my therapist on an inpatient trauma unit, and at first I thought she was way out of line. But she pointed out that engaging with my parts wouldn't cause any harm if I made them up, but if I hadn't made them up, then pushing them away could do tremendous harm. Everyone has parts of themselves, although the average person's parts are more integrated. But engaging in dialogue with my parts isn't really that much different than a person debating with themselves about conflicting desires. It's just a little farther along the spectrum.