You can try and tell your parents that you’re not ready to wear the hijab yet. You shouldn’t have to be forced into wearing one if you’re not ready. The commitment is between you and Allah and if you decide to wear it than it should be because you want to please him. If your comfortable with it you can tell your parents that you can ease into wearing the hijab by wearing it x times in a week/month/or whatever you decide. They should be able to understand that, inshallah, and respect you for coming to them instead of sneaking around.
I hope everything works out for you!
I think if he identifies himself as Arab I wouldn’t sit here and argue that he is something else, it doesn’t really matter if he’s Muslim or where he was raised or who he’s married to (: