All you can do at this point is to do the best you can on the essays, resume, rec letters and interviews (should you get them).
I wouldn't completely neglect talking about stuff outside of work. However, based on what you wrote your extracurriculars aren't something that you should really emphasize (which yes, will be a weakness but why make it more apparent by highlighting it). In plain English, it seems like you have fun outside of work, but that's about it (nothing wrong with that, but there's not much more you can say beyond that). Focusing on work-related examples will likely best play to your strengths - and just hope that that's good enough.
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