Quit defining yourself as socially awkward / complex / shy / all that other bullshit, you're setting yourself up for failure.
Social weaknesses tend to come from social inexperience: go practice and stop blaming that fear on bs self-imposed personality traits.
You need to stop overthinking this.
Just fucking tell her what's on your mind, it's not like you're facing a moral dilemma or anything: it's an old-fashioned, useless, sexist tradition. Just talk about it, if she makes a big deal out of it -> NEXT
Easy peazy jeezy