I completely understand where your coming from, I have a similar issue. Something my T asked me the other day made a heap of memories come back, memories that deep down i knew were always there but I kept telling myself nothing happened and I think over time I believe myself.

I told my T that I wasn't sexually abused when she asked but at that time I had a really blurred version of what sexual abuse was. My dad was never affectionate, it was extremely rare to get a hug from him, but then when my mum married my stepdad he was extremely affectionate, so I think in a way I had no real idea of what a male should and shouldn't do. So I created my own views on what is 'normal' behavior and I am only now reliesing that what I had thought all along was in fact what shouldn't happen.

I am too contemplating telling my T, I have written everything down so I think I am either going to read it out next session or get her to just read it, but I am a bit scared of what my reaction will be when I tell her cause like you I have kept it secret my whole life and I think I have somehow suppressed my feelings about it.

But I reckon you should tell your T, those things shouldnt of happened and there is obviously a reason why you are beginning to remember stuff so by telling her she can work through it with you and you never know you may feel a weight lifted off your shoulders, I know that's what I am hoping for

Good luck with what ever you choose!