I would 100% be a woman if I could choose
Well, that’s a pretty good indication right there
How do I know it's not just sexual attraction?
Cis people generally don’t experience the desire to transition when they experience attraction
Or me being unhappy with the role men have in this world? Or me being depressed otherwise?
This can still be true if you are trans. It sounds to me like the best possible thing would be for you to connect with a therapist, preferably one with experience in gender affirming care. That would go a long way towards untangling the mess, although I know it isn’t accessible to everyone depending on your situation.