It is important to note that your BMR is the number of calories you need just to lay in bed all day-for basic body function. So waking up, eating, walking to your car, etc are not included.
I understand your worries about not eating back your exercise calories, but I would encourage you to use a TDEE (total daily energy expenditure) calculator to get a better understanding of how many calories you are burning daily on both sedentary days and on active days. Remember undereating will get you no where!!
....if you always do what you always did, you'll always get what you always got...
Crossfit L1 Trainer
| current weight: 131.6