If you need to share it, if speaking the words aloud will help set it free from your mind, say it aloud. Talk to yourself, imagine you're telling the story to someone else, whatever helps you.
It may sound silly, but some of my breakthroughs have come from saying things out loud when I was afraid to for years... because saying it might mean that it really happened.
So... Monologue. Talk to youself when you know nobody else can hear it. Whisper it. Scream it. Whatever you need... And once you're comfortable saying the words, perhaps you'll want to say them to the therapist... or you might not need to. Could go either way. :)
As far as the memories and shame - abuse is abuse. It doesn't matter who did it, the body can react in ways that are sexual to abuse that will mentally damage you more than the physical. You're stepping through digramming what happened above:
Abuse from females -> inappriate relationships with males -> wow, maybe all relationships are tough and I don't know what's healthy for me -> I need help, can I talk to my therapist? Is he even safe?
Good luck, I hope you can find what you need.