Out as trans, now I have to be kept a secret

My girlfriend comes from a very religious family. Her older siblings knew about our relationship when I still identified as female, but now that I identify as male and am taking steps toward hormones, surgery and a name change, she is keeping our relationship secret. First and foremost, I was already frustrated by the fact that she refused to tell her parents about me before but now I feel like she's downright ashamed of who I am. I understand that it's difficult to come out to your parents (I did it and I'm still trying to mend my relationship with them, but at least they know!) but I'm in a serious relationship with this woman. Perhaps I'm being impatient with her, but it's so incredibly hurtful when you feel like someone is too ashamed of you to even tell their friends and family about you.

I apologize for ranting, but I really have no one else to talk to this about. All of my friends say that it takes time, and it does, but it's been almost a year and I'm still being shoved in closets, hidden away like I'm a freak or something. We're both adults, at 23 and 22, so why are we still doing this?