How Come Using Yahoo Home Loan Calculators It Seems Like I Am Paying Way Too Much For My Current Home Loan

Took out a loan six years ago for like 90K at 5.75%.'m Paying around $ 900/month on it over 30 calculators on Yahoo yrs.The say though I CAN get a 90K loan now at 6% and pay only $ 540/month Over 30 yrs.What IS going on? Did I just get taken to The Cleaners Somehow? Is There Anything I Can Do?