Hi! I was really surprised to see that 90% of what you've written matches up with what I'm struggling with as well. I'm 17, AFAB with PCOS and have been very confused about my identity as of late.

When I was a child, I behaved more like a boy than a girl, refused to wear anything feminine and wanted to play soccer with boys on the playground. I hated how my mother complained when I wanted toys "meant for boys" and watching cartoons "also for boys" or whatever supposedly gender assigned thing there is for a child to enjoy.

Now that I say it, it sounds a little dumb, because I strongly believe colors, sports, entertainment or clothes shouldn't be gender specific, but at the time I was proud of enjoying "boy things" more, because I was raised to believe that such a thing exists.

In middle school, I hated the color pink with a passion, and didn't care about what I would wear and tried to come off as more masculine than I was. However, I kept my hair super long because I had a weird fear of cutting it.

Now, in my late teens, I freely express what I like and have found that my peers don't care about gender assigned things and are happy to announce that they too like the same things I do, for example.
However, even with all that in mind, after all the time I've spent living as a girl, I suddenly feel fairly disconnected from my gender as well, as if I'm not supposed to be who I naturally am. I desire to be more physically neutral. I've come to realize I wouldn't be suited for a boy either and seldom experience gender and body dysphoria that fuels my anxiety and depressed state.

The demigirl term brought a smile to my face, because, to an extent, I feel a disconnection from the term 'gender' as a whole. Currently I go by she/they pronouns, but am referred to as a she because my native language doesn't have a singular they, unfortunately.
Following that, I tried to talk about it with my mom once a few years ago, but was brought to tears with her misunderstanding and her inability to grasp such a topic. I don't blame her for it, as she managed to accept all my other queer friends (in terms of their sexuality, which she really tries to act normal upon.) She even understands the concept of a transgender person, which I do know quite a few of, but introducing someone 'genderqueer' or 'non-binary' might be too much for someone that was raised with difficult parents during war and inflation.
My father, on the other hand, doesn't really try to make any sense of it, and queer people are essentially just weirdos to him, but, frankly, he doesn't exactly care or bring anyone down, so it's fine.

I was also confused about my romantic interests many times, but I just went with 'if you like them, that's fine' and made myself gender blind in that regard. I won't elaborate on sexuality, because I believe I have problems with sexual aversion, so I wouldn't know, but I see you have that figured out, so that's good!

Anyway, usually, the advice I give to people with this problem is to not think about it too much and be the way that feels right to them. Dress how you like, behave how you like, as long as it doesn't hurt anyone and makes you feel good and accepted in your own body.
Sometimes it's very difficult, as of writing, I feel it hard to act upon my own piece of advice, but, hang on, and if you need to, talk to a trusted friend or see a good therapist.

Thank you for sharing all of this, I'm glad I'm not alone in any of this. I wish you all well