help me someone before i die from obesity

ok this are the calculations I did for a 56 y/o female at 235 lbs height of 5'1" I am to consume 1720 calories and moderate active I go to the gym 5 days a week  my burn calories are 2470 just to live at the stationary bike alone I burn 300 calories and strength training for 50 minutes is about 230 burn so total burn I do at gym is 530 so my example is 2470 +530= 3000 I burn daily then I take 3000-1700=1300 now are my figures right because I did not lose one lb at all for the week so please let me know what is wrong with my figures I need to lose badly my health depends on it please help all info is up here  thank you to all that will help but please put in very simple terms thank you you might be saving a life

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