Some heterosexual girls / women transition because they want to have relationships with men but don't want to be the 'woman' in a relationship
I thought that was called feminism

Serious point though through that... there's two ways to deal with misogyny in society. Either through "transing" it away, which to me is false consciousness, as it's a liberal, individualist solution to a collective, societal wide problem. Individuals may be able to (somewhat) escape through the bars of class oppression, but it leaves them intact for everyone else. It has the superficial veneer of progressiveness, but it's as regressive as the get-on-your-bike entrepreneurism of Thatcher - the few get rich, the many left behind.
The true progressive and radical solution is feminism, it breaks down the bars for everyone. De-coupling sexed bodies from gender expressions and expectations liberates everyone... men are free to wear dresses and make up if they wish (and still be men), women can have cropped hair and do car mechanics (and still be women). Men step up to their share of childcare and housework, women have more time and energy to further their careers into the boardroom.
Transgenderism is an outward manifestation of neoliberalism and post modern capitalism. It's the ultimate in commodification of bodies - identities are there to be bought from the marketplace... fashion, make up, decoration and cosmetic surgery. Gender is viewed as an aesthetic to be "curated" through commodity fetishism, not what it truly is... a brutal hierarchical arrangement of power that sees women harassed, sexually assaulted and viewed as a resource to be extracted for their sexual, reproductive, caring and housekeeping labour. Justice and equality can never be achieved by individualist solutions to collectivist problems.