I just wanted to add my good wishes for your processing of this, OP, and to add: it's not surprising that it hasn't surfaced until now, or that you haven't really come to think more about it until now.
Your experiences are a double-whammy of child-perpetrated and female-perpetrated abuse; both are massively under-recognised. I think it's because they fly in the face of the assumptions people make about who children are safe with, so they don't know what to do or say.
They're almost never talked about in the press, except when there's an exceptionally dramatic news story, and the suggestion that an abuser who's female or a child is very unusual is often part of the reporting. Even though research suggests otherwise. And this kind of abuse is very rarely depicted in fiction.
My point is that all this makes it very easy to minimise your own experiences or to put them to one side without having dealt with them. That doesn't mean they were less damaging than anyone else's, or deserve to be taken less seriously.
Issues with feeling controlled are incredibly common after sexual abuse, and you're absolutely not over-reacting by looking to explore a possible link.
Even if you end up feeling like actually those experiences weren't that big a deal to you, it's a really good idea to spend some time figuring out your feelings. And you doing that takes nothing at all away from other people and their feelings about their experiences, however you end up seeing your own.
If you'd rather not, or cannot, pursue private counselling, it's a valid reason to ask your GP for a mental health referral, but they may also be able to give you details on other support in your area, such as phonelines and survivors' groups. You can ask at the initial contact with a support organisation whether they are able to support victims of abusers who were children or female, but - provided they're not explicitly for other groups of survivor - if they're any good anyway they should be happy to.
I hope everything goes well for you. Best of luck and take good care of yourself.