I’m making a quick exception to answer this…no you’re not burning 300 calories a day. Your basal metabolic rate is what you burn just by LIVING. By laying in bed all day I would burn 1379 cals as a female w/ my height, weight, and age.
Your daily energy requirement based on your level of activity will be much higher. Say I am pretty sedentary, my daily energy requirement would be 1900 cals. Lightly active, 2100 cals. Consume less that THIS NUMBER, your daily energy requirement, and you will lose weight.
Use this calculator to figure out what yours BMR and Daily Energy Requirements are: