Also, about the Am I A Lesbian masterdoc: while it's a landmark resource for many WLWs, it doesn't hurt to reiterate that it was made by a teenager. A very intelligent and articulate teenager, but still a teenager. The document has no academic or professional legitimacy, and it has been charged, most prominently by bisexual people, with the erasure of bisexual experiences of attraction to men, not to mention how it doesn't discuss aro-ace realities and how being on the aro-ace spectrum can complicate matters.
The notion of comphet is also broader than what the masterdoc makes it out to be. It's actually a theory of patriarchy by the feminist philosopher Adrienne Rich, who sets it out in this very easy-to-read paper:
Compulsory Heterosexuality and Lesbian Existence. Compulsory heterosexuality is a system with economic, historical, and political dimensions; it isn't just about women's experiences of male-focused attraction. While it's a very important concept, it's been problematized by other queer thinkers, precisely because it may be read as erasing bisexual experiences of attraction to men (although I don't always agree with that criticism--like I said, Rich was proposing a theory of patriarchy, not a theory of attraction), and also because Adrienne Rich had near-TERFy politics. These queer thinkers suggest replacing the concept with terms like institutionalized heteronormativity, which don't run the risk of erasing bisexuality and designating lesbianism as the only "unproblematic" sexuality (although that's an uncharitable reading of Rich's work on comphet, the impact of the concept has been such). Here at Scarleteen, we obviously don't condone viewing sexuality as necessarily a political statement, because you don't have control over your sexuality!
All this to say: take the masterdoc and its predictions of lesbianism with a bucketful of salt, and feel free to read up on comphet, if you haven't already!