Yea your sexual orientation can change so you will no longer be cursed by heterosexuality. Getting fucked in the ass is way better than any P in V sex you can have, only way to have a good orgasm if you are male.
Before you transition you have to develop a female persona and get eroused by the though or image of yourself as a women. Good anime to watch are tsf monogatari (hardcore) and kämpfer (soft).
taking estrogen will change your personality and you will become more like a women mentally.
If sexuality doesn’t fully switch Many MtF women go for other MtF women, a few manage to get a lesbian and make her pregnant.