Yes lovely, it is so normal to forget part of, or even all of your experiences of being abused. It’s called repressing memories and I’ll put some links in which may help explain it further.
The way I think about it is as a part of Freud’s iceberg theory:
Traumatic events can be stored in the unconscious level, which means we may forget about them, even though we may still have feelings of anxiety in certain situations.
Links:
This link explains Freud’s theory further and also talks about the evidence issues.
Biological Basis of Repressed Memories
This is very in depth and long, but I skimmed it and looks pretty informative.
Someone’s story about their repressed memories.
The thing to remember is that not all people believe in repressed memories as there isn’t really any solid evidence backing it up. Also, although most of the information out there is to do with sexual abuse, I’m sure that repressed memories can happen with any traumatic event.
If you need any more help/clarification over anything, don’t hesitate to ask xx