Sometimes I have the sense we're not actually talking about me or relating to my current self, because that is who my trauma impacts.
Do you feel something similar when you're talking about your trauma in any detail? I mean, when you go into painful trauma stuff, does it feel like you're talking about someone else's life in a way?
If so? Then it makes sense that talking about your inner children would feel similarly dissociated from your identity.
Compartmentalising is a way that we cope with our traumatic past (no news there). For some people, it's a lot like "stuff that happened when I was 6 goes in the 6-year-old Box", and on and on, separating out our lives into compartments, then locking them away where we don't need to deal with them. And that's how we continue on with each day.
That doesn't always translate well for everyone when you talk about those boxes as 'inner children'. But, one of the therapeutic benefits of doing it that way, is you approach the trauma from the perspective of the person it happened to: a 6 year old (for example), rather than an adult, with adult emotions, sense of self, and understanding of the world and our relationship to other people in it.
The other benefit (for a smaller number of people) is that their development can, quite literally, get emotionally arrested at younger ages as a result of trauma. My sister, for example, is the emotional age of a teenager. That's less likely to be why your T is approaching it this way.
It's possible that anger? Is a perfectly appropriate reaction to addressing your inner child. Is it possible there's part of you that is angry or resentful to the child that experienced your trauma? I often feel like "that child" kind of screwed up my life, and yeah, that can make me pretty angry. And dealing with that anger (anger at myself), is actually a significant stage of my healing process.
So, in itself, anger may be exactly how you're 'meant' to be feeling right now.
Alternatively? Inner child work may not work for you. And that's totally okay too.
If you'd like to work more on the 'here and now'? It's okay to tell your T that. Or at least, it better be, because it's what I told my T last week. "We aren't gonna do more digging at trauma right now". Because it's not the right time for me to do that.