I feel for you so much. The vaginismus makes any penetrative sex scary. Many of us sexually abused as children, whether by same or opposite sex perpetrators, question our sexual orientation or other aspects of our sexuality as being "caused" by the abuse, and that is so painful.
Consider this: many anti-gay people blame child sexual abuse by a male abuser of a female victim as a reason why a woman is a lesbian (rationale: the abuse by a man was so bad, we turn to women.) At the same time, they state that male survivors who were abused by male perpetrators "turn gay" because of the abuse (rationale: the abuse by a man was somehow pleasurable that men want to recreate that with other men.) It's just totally irrational and inconsistent.
One's sexuality is so complex! There are many factors that influence one's sexual attraction, orientation, identity, preferences, etc., etc. Most credible researchers and professionals agree that sexual
orientation is innate ("born that way"), although one's sexual
behavior is often influenced by prior experience. Consider all the LGBT people who were never abused, and still "turn out" gay/lesbian/bisexual/transgender)
IMHO, it's both nature and nurture.
When I was first coming out (age 15-16), I struggled with this for a short time, but ultimately, i just don't think there's anything wrong with being gay (I was raised by a heterosexual but radical feminist/hippie mother!) I heard someone once say, they didn't really care where their sexual orientation came from ... Maybe that was one good thing to come out of the abuse!
That said, I still struggle mightily with other aspects of my sexuality and how the past continues to impact my present. I haven't yet addressed this with my T, but I am working with various other issues that make me feel ashamed. Please take heart that
you are not alone, and this is a common issue for many of us.
Self acceptance can come, but I agree with
@Ronin that the first thing to work on is general stabilization. Get that under control, and the other stuff can come later as you develop trust in your T.
Have compassion for yourself, dear. And hang in there.
Very gentle hugs if you accept them.
-- Lola