Need advice!

I was invited to do a sustainability interview with RA, which I am extremely nervous about. I applied back in July, thinking that it will at least take about a year or more to be called for an interview but I guess things are moving faster than I imagined. Mentally, I don’t think I am 100% ready to do this interview. I can’t disclose the reason why but I am quite hesitant if I should withdraw my application and re-apply again or just do the interview, with the chances of screwing things up.

Do you guys think its good idea to withdraw my application and re-apply when I am 100% ready or just do it and get the deferral?