Hi NH,
My first bit of advice is that you should definitely seek a therapist to help you deal with all these questions, especially the ones around how OCD could be related to or affecting your gender questioning. From what you wrote, you are probably already in contact with medical professionals, but it may be good to find some who are experienced in trans issues if your current ones aren't already so.
Having said that, I'll just add a little of my own experience here. I too have mild OCD-like symptoms. I've never got a formal diagnosis or had any other problems or been under any medication, but I do have a set of repetitive stuff I do which others around me don't, which has been around since childhood I think, and which gets noticed and commented on all the time. I say it is 'mild' because when I really have to, I am able to avoid that repetitive stuff, though not always.
Since I started questioning my gender identity and then finally accepted it, I've had some doubt whether it is my OCD which is driving this. But I think my OCD is much milder than my feelings about my gender, and I do have a pattern of memories and experiences since childhood which are for real and which fit in with my gender identity, so it can't be all driven by OCD. Like you, I have some feminine physical characteristics, though not as extreme as the intersex conditions I've read about, but they remind me of wanting to be seen as female rather than any desire to be more masculine which I've hardly ever had, if at all.
Also, for various personal reasons, I am taking it slow, waiting to see how strong and persistent my feelings are, and slowly experimenting with my appearance. I'm also in regular contact with a therapist to help me process my feelings and rule out alternative explanations if required. Next steps, if I go for them, would be HRT and the gradual changes it brings. Surgery is a very distant part of this process, if it has to be a part at all, so one has enough time to figure out if one is on the right path.
Everyone's story here is different, but asking yourself the right questions at each step with or without professional advice is key to finding the right answer.
Take care
Cindy