For me, the egg came before the chicken.
I was gay before the abuse, during the abuse and after. This question was simply never an issue in my case.
Except, of course, for the 23 year detour through a marriage, fathering three children, and a full length active duty military career.
In your case, TofT, it would seem that issues of self esteem, self body image, and/or self worth are also mixed up with your questions about sexual orientation. Unravelling all that could take some time (quite a bit) and might be easier if you somehow could obtain the help of a therapist. I know that's not always practical or feasible but check out your local resources, some of which might be low cost or no cost public facilities.
I think that I am starting to ramble here, so will sign off with best wishes.
Be gentle and patient with yourself.
Love, etc.,

_________________________
"We are only two and yet our howling can encircle the world's end.
Frightened, you are my only friend.
And frightened we are, every one.
Someone must take a stand -- Coward, take my coward's hand"
Arthur Laurents