Hi
I'm sorry to hear about your SA and difficulties. I was SA when I was younger. I had never had sex before, and then since then I have had difficulties too. I had a period of time when I was drinking heavily and sleeping around as I lost respect for myself and I never O once.
I found that I would never be able to 'let go' enough, I was always incredibly anxious and I would freeze.. so I could never orgasm. I met my husband 7 years ago and even with him it was pretty much like that for the first 5 years. However, I now manage to orgasm through 'other ways', so I just wanted to say, I know how you feel and I was told by one of my many therapists that it is normal to feel that way.
So I hope in time you find the person that makes you ooo!
xx