If your caloric intake is set at 3600, you either need to see a new doctor or you are extremely obese. That is almost twice as much as the recommended caloric intake (2000 calories) for the typical adult male.
The recommended caloric intake for an average (5'10", 160lbs) 17 year old American male who doesn't do much exercise (ie most of them) is 2050 calories a day. For athletes doing more exercise, this will obviously be higher (500-600 or so) and should be taken into account at breakfast, since that is where you get much of your daily energy.
And we wonder why our children are obese, when parents think a surplus of 1000 calories is normal.