mistakes? not again!!!!!!!!

I do mistakes,everybody do,but I do more than any average human being. Now it's time for me to pay for my latest mistake. When I applied for IBPS cwe clerk online,there was question that whether I'm a dependent of an ex-service man(DXS). I opted 'YES' as my father is an ex-service man. But then my system generated fee to be 50 rupees,I tried to change it into general fee,but I couldn't. I cleared the exam,got score sheet. But it showed the cut-offs needed by me as 17 for each part,but it should be 19 as I'm a general category candidate. My interview is scheduled on 20th and now I got clear from the DXS certificate that given in IBPS site that DXS means dependent of ex-service man who got killed in war! And I'm screwed up. I opted to be in a wrong category. Don't know what to do,how to solve this problem. I got at least 20 marks in each part of the exam,so that's not a problem to be in be the general category selected candidates list . But I want to change my category from DXS and the notification says it  won't allow any changes  in categories. It was my mistake that I didn't read the notification completely. But the question in application was 'Are you a dependent of an ex-service man?' and nothing else that clearly deceived me.  I'm so confused and worried,I think I cannot appear for the interview,this is the last thing I wanted for now.