@MargoLovebutter I'm very sorry to read of your experiences.
One thing that happened with my son a while ago was that we were at the doctors and I mentioned I was not his biological mum. I was saying it to make a point that my medical records (and frankly crap health history) would not impact on him.
At home he repeated it and we spoke about it a bit. I said 'it really doesn't matter to me at all whether you grew in my tummy or not."
When he was younger (he is nearly 8 now) he used to accept this happily and seemed to really want to have been born to me. Now he does ask questions more and is really at a stage where he does seem to processing it all.
One thing I need to remind myself is that although it may not matter to me that I am not his biological mum, it may matter to him.
I'll definitely not bring it up at the doctors again, unless it is relevant, because I feel sad, like I hurt his feelings a bit by telling a doctor we did not know (have not seen before or since).
But I must also say my birth daughter gets very upset about some things too and often I am the 'baddie' with the kids whatever I do. I am trying now to take note of times when I do say the wrong thing and work on it because as they get older they are more aware.
It is great to have the chance to hear a variety of views from people who have been adopted. So thank you all. 