CVictor, there really are no words for what you went through. You deserved none of it.I can't think of any possible excuse for a half dozen stronger, nastier people to gang up on the youngest.
I didn't have feelings either, not for the longest time. I was just numb. It's only now starting to trickle back. So I can tell you the conclusions I've come to about my own situation. Yours is going to differ, obviously, so maybe some of those things are helpful to you, maybe not. You'll know best. So here goes.
Those feelings about what caused my CPTSD are so overwhelming, the fact that I'm not feeling them is a blessing in disguise. I'd be paralyzed by rage, grief, and fear. I'd probably be having a lot more flashbacks. So I'm guessing my subconscious, like the wise helper it can be, is sending me things up in bite-sized itty-bitty pieces. At least for now.
Usually (at least with me), those feelings come up once my subconscious decides that (a) I'm safe, and (b) I have all the resources I need to process all that. Sounds sensible, no? But it often means that I'll be happy and fulfilled and enjoying life - and then WHAM, a huge feelings vomit from way back when. But eh, what can you do. It has to come out somehow.
Moreover, there are many ways to process trauma. So if the feelings won't come, what I can do is process things mentally. Simply just remembering my adolescence and childhood is a bit of a task. And then I have quite a few introjects - little inner voices that echo things my abusers said. Getting rid of them, it's a bit like tidying up my mental furniture, making my psyche a safe place for my traumatized ego states. And like I said, they do emerge once it's safe. Sooner or later. Most times later, but they come eventually.
Conclusion four: We look at our trauma and realize at once that we
should feel something about them. And instead, we feel nothing. So it's tempting to just think of this as an absence. Something failed to function, as it were. But numbness
is an emotional response to trauma. It's not a non-reaction. It's a BIG reaction, a very big change in our psyche. We had to batten down our hatches to survive. And hatches that have been battened down for a few decades take quite a while to come unstuck.
Did you ever watch
"Field of Dreams"? Now, maybe this is too fanciful - but I'm sometimes thinking that CPTSD recovery work is a lot like that. "If you build it, they will come." So we go on chipping away at our trauma, doing all those little things that seem to only let us get ahead so slowly, always trusting that one day we'll see the fruits of our labours. And it happens. There are breakthroughs. But quite often, we have to wait for them for a long time.
Right where you are, your situation as it is now, that is a triumph in itself - that you're able to stand tall and say "this happened to me" and "it wasn't my fault".

I was stuck for ages in the stage where I thought "nothing happened... and if it did, it wasn't really bad... and if it was, it was all my fault anyway". So kudos to you for seeing things so clearly.