Is it possible...

It seems like all of your posts and threads here are focused on questioning, and that's understandable, because it can be challenging and confusing to come to terms with whatever you are when you start questioning your sexual orientation.

To answer your direct question: There's no credible support in the psych or sexology literature for the idea that trauma (sexual abuse, etc) can change sexual orientation. It can and does often cause people to think about their orientation earlier in life.

For example, if you are female, straight, and have severe sexual abuse from a man, you might feel safer around women, and might even find it easy to be close to women... but if you are straight, then you're never really going to feel sexually connected/attracted to another woman.

Likewise, if you're a straight guy and you are sexually abused by an older female (most commonly in this circumstance, your mother), then you may feel very uncomfortable around women and find it easier to be around guys. But again, if you are straight, you won't feel a deep physical/sexual connection when having sex with another guy, it will always feel somewhat to very "off."

Now... complicating matters, most people, when they start to have same-sex feelings, desperately don't want them, and will do anything to convince themselves that these feelings aren't real, or there's some explanation for them, or it's a phase, or it was caused by this-or-that (theory being, that means they can change). And that's all part of the normal processing of a loss (in this case, loss of identity as straight.) The stages are denial-anger-bargaining-grief-acceptance. So denial is very common, and sometimes denial gets very elaborate.

As an aside, this is part of where the bogus diagnosis of HOCD came from; while OCD is a very real condition that people suffer from, it is pretty rare, and nearly always, people with OCD obsess over more than just their sexual orientation; HOCD is a bullshit diagnosis promoted by the religious right to justify, for people who are gay and in denial, that they really aren't gay. And it's a huge disservice to both people with real OCD, and people who are gay and in denial.

Finally, there is zero evidence in the credible psych/sexology/scientific literature to indicate that shame has any impact on sexual orientation, except that shame may keep many people who are gay from accepting that and coming out.

So the bottom line is really where your attractions are... when you are out and about, at the beach, at the mall, wherever... where do your eyes go? What parts of a man's or woman's body attract you? When you masturbate, what are you thinking about? That's where you'll find the real answer about where your attractions lie, and that's all that matters. Because that's unchangeable, isn't affected by trauma, etc.