I think joke is too strong a word. I think your boyfriend probably just takes it lightly at the moment. He likes you and it is not a big deal for him.
I have many friends who say the same thing(they are good at support), but there are some honest ones who will tell me I'm only getting about 50% of a conversation.
To be sure, men don't think as intensely about conversation as women. Yea, we like conversations, but it's not a deal breaker if a woman can't communicate well.
On your side, you need to take care of the fact that you are going through some changes. Sign up for a relay service and take some ASL classes.
You'll be fine. Life doesn't end here.