Hang in there, you have lots of brothers and sisters here to support you.
I spent a long time in bloke-mode just watching how women did things, so I had some idea of what not to do.
I'd say, okay, you have realised you are a guy, the question is what sort of guy?
What were the qualities that attracted you to your husband? That might be a good place to start your research.
As for others, maybe just saying that you are questioning the whole concept of gender and identity will be enough if people ask. You don't have to commit to anything, just working out your own place in the scheme of things is sufficient. If your husband is accepting, then you are streets ahead of a lot of us.
Be gentle with yourself, and try and look at this as an opportunity for growth that most people don't get.
Rant away too, if that is what you need. That's what blokes do anyway!

Karen.