Most Helpful Guy
He's completely oblivious to all of your "mess ups." He's probably just happy to be with you. He probably completely missed your sign language.
You're fine you just feel awkward right now. Realistically you'll have a hard time keeping this relationship into your college years. Don't worry enjoy it and be glad you're in a relationship. In high school I was to awkward to have anything like what you have.
Most Helpful Girl
You'll be fine. Just need to chill and relax. In fact, I think both of you are so adorable and cute. Holding hands and being shy about it. Awwwwww, so cute. A few mistakes here and there is fine.