student loan repayment(very detailed)?

I just recieved a loan for 12000.. I am wondering if i can start paying it off before the due date so i wont incur all these finance charges...it is as followed..annual percentage is 11.864% and there will be 240 payments of 222.64 starting 3/20/2011. The dollar amount the finance charge will cost is 41,433.60 and total payment total up too 53,433.60. I am assuming this is if i just pay the minimum right? Can I start paying the loan before the payment date and make 50 payments of 262.30 so i can pay off the loan(all together 13,114.75) plus the finance charge and origination fee odf 114.75