I hope none of this discourages you from telling the stories you want to tell. They are valid, valuable stories about things that really matter, and there is an audience out there for them.
Some inner critics need love and some need reassurance. Yours needs to be gently but firmly set aside. It exists only to harm you, and has no place in your life.
If you're still stuck in the conflict between wanting to write (for some reasons) and also not wanting to (for other reasons), think about what kind of reluctance you're experiencing.
The best beta reader for your book is one who's primed to love it, and who can work with you to make it the best possible book on its own terms.
The visual is a hook, a way for the reader to be drawn into the story.
It's hard to push forward through the doubt and tempting to try to wait until you feel more confident, but the way to get more confident is to do the thing; confidence comes with experience.
Queer and trans narratives are so often revelation narratives that it's easy to forget there's a lot more to our lives than that.
Until you make your abstract goal more solid and figure out what makes it personally meaningful to you, it will keep losing out to shiny new ideas.
Surely you can write one word, even if it's "The" or "If" or "A". And if you've written one word, surely you can write another.
Voice is a skill to be developed, like any other writing skill. Give yourself permission to stretch it and challenge it and expand it and enhance it.