You're not getting it. People can be born gay, but they don't fit the gay role naturally, they put it on, whether consciously or otherwise. A gay guy fits a certain role, look and lifestyle, so does a lesbian, so does a straight guy/girl. Those acts are social constructs.
So doesn't this imply that anyone can be gay by choice? Would a person who is born a gay be happy playing any other role?
I know someone who moved from a conservative Muslim country to the US and consequently "found herself" as a lesbian. Now you'd be able to tell she's a lesbian from a mile away. That doesn't mean she's not really a lesbian, she just became one.
She could have been a latent lesbian. The social construct in her native culture prevented her from expressing her sexuality, once she was placed in a free environment she discovered herself.
Even I changed a lot since moving to a totally different culture. It doesn't mean I'm not myself anymore, I just became different. I've tried so hard going back to my old self, but there's no going back, because the guy four years ago is not the same guy today.
Change is the law of nature.There are some aspects of your personality that are amenable to change while there are others that are immutable.
Our personalities are social constructs, literally acts we perform to fit the role we believe best reflect us in the society we're living in.
It would be more correct to say that personas are social constructs.
PERSONALITY=PERSONA + INNATE QUALITIES
Otherwise individuality would reduce to being a mere difference of physical attributes.
Even identical twins are not same in all respects.