Yes to all of this!
Yes to all of this! When it comes to gender and sexual orientation, people choose and are drawn to certain labels for all kinds of reasons, and it’s not something we can easily “diagnose”. I’ve had students ask me how to tell for sure they are trans before — just as I’ve had friends ask how they can be sure they are Autistic — and I usually tell them, if the label feels good and right to you, or if using the label helps you forge community with people you share common ground with, that’s good enough. You don’t have to be “sure” a label fits perfectly or will fit forever. As long as it’s a useful tool you can pick it up and put it down as suits you. That’s what I generally believe anyway!