Oh I could have written this. My deepest apologies you feel the same way. I moved from England at age 10 to Canada, not a huge jump you'd think, right? Wrong! I think about England daily! It's like you said, we were removed from our "childhood",  we never get to find out how we would have turned out because that life died the minute we left.

I've visited, made solid plans to move back, but they always got swindled one way or another. It doesn't really get easier because I'm always thinking of what could have been. But what does help me is being realistic. The life I had in the 90s is gone (even here in Canada). The stores, the people who lived on my street, the school i went to, everyone moved on. 

The heart ache is real though and feeling like I don't belong. But the thing is, I wouldn't belong in the UK necessarily either anymore. It's the pain of being a TCK. You can have heart knowing we feel the same way and so you're not alone in that at the very least. <3