Trying to lose weight and getting a little worried

If you consume the same amount that you are working off, you're effectively not fueling your body at all, which will lead to all sorts of unwanted side effects. Put all your details into MFP, and go by what it tells you to eat - and eat back at least 50% of your exercise calories (I eat all mine back and am losing steadily).

you do realize you don't have to run off or exercise off all of your calories right? exercise is rather insignificant to you overall calorie requirements and thus "burn"....you burn far more calories just being alive than you could ever do on a consistent basis with exercise. The average female "burns" roughly 1400 - 1500 calories just being alive...the average male burns around 1800 - 1900 calories just being alive. Then on top of that you have you day to day bull **** and then finally some exercise...maybe.

Ever wonder why nutritional info is given for 2,000 and 2,500 calorie diets...because the average female maintains weight right around 2000 calories and the average man maintains weight around 2,500 calories...and I guarantee you that nobody beyond a professional athlete or someone getting paid to exercise is "burning" that many calories with exercise.

I'd suggest doing quite a bit more research in RE to proper nutrition, calorie requirements, fitness, etc....you're heading down a pretty disastrous avenue here.

A couple of things:
1) Pick-up your calorie intake. If you eat less than you should your body will store what it can as fat as a precaution.
2) Weigh yourself at the same time and in the same outfit....this way there isn't a weight differential due to clothing.
3) Muscle weighs more than fat.
4) Don't weigh daily as it can get frustrating and the numbers will fluctuate. This can be caused by eating something different, drinking liquids, water retention, waste build-up or even hormones.

Recommend weighing weekly and preferably 1st thing in the morning right after using the bathroom and before the shower.

As for the joining the Air Force, congratulations....my suggestion there is endurance. Most of your fitness tests will be cardio related i.e. running, sit ups, and push-ups.

You can't keep your calories down & lose weight. Especially if you are lifting weights.
You probably should be eating 100 calories & increasing when you lift. V

Check this thread

http://www.myfitnesspal.com/topics/show/1161976-adopt-a-noob-official-mfp-thread

Well, you have an account here, so that's a start. Set up MFP with your current weight and your goal weight, and (I recommend) a setting of losing 1 lb per week. Set your protein macro to 0.8 to 1 g/lb of lean body mass. Eat all of the calories it gives you. Log your exercise and eat half of those calories back.

You will end up in the hospital with the road you are going down now. If you don't EAT to fuel your muscles, you will LOSE them along with the fat. That is, if you can manage to hold out for more than a few days at the rate you are going.

A couple of things:
1) Pick-up your calorie intake. If you eat less than you should your body will store what it can as fat as a precaution.
2) Weigh yourself at the same time and in the same outfit....this way there isn't a weight differential due to clothing.
3) Muscle weighs more than fat.
4) Don't weigh daily as it can get frustrating and the numbers will fluctuate. This can be caused by eating something different, drinking liquids, water retention, waste build-up or even hormones.

Recommend weighing weekly and preferably 1st thing in the morning right after using the bathroom and before the shower.

As for the joining the Air Force, congratulations....my suggestion there is endurance. Most of your fitness tests will be cardio related i.e. running, sit ups, and push-ups.

Your body does not hold onto fat under a calorie deficit.
A lb of muscle weighs the same as a lb of fat.

A couple of things:
1) Pick-up your calorie intake. If you eat less than you should your body will store what it can as fat as a precaution.
2) Weigh yourself at the same time and in the same outfit....this way there isn't a weight differential due to clothing.
3) Muscle weighs more than fat.
4) Don't weigh daily as it can get frustrating and the numbers will fluctuate. This can be caused by eating something different, drinking liquids, water retention, waste build-up or even hormones.

Recommend weighing weekly and preferably 1st thing in the morning right after using the bathroom and before the shower.

As for the joining the Air Force, congratulations....my suggestion there is endurance. Most of your fitness tests will be cardio related i.e. running, sit ups, and push-ups.

Your body does not hold onto fat under a calorie deficit.
A lb of muscle weighs the same as a lb of fat.

You are mistaken by over generalizing.

You're body won't hold on to fat if you're eating at a modest deficit. However, if you're netting 0 calories per day (as you can tell he is by doing the math from his post) it's possible to throw your metabolism out of whack, I put his numbers into scooby and to be losing at a 20% deficit he should be eating 1800 calories(ish) . The "you lose under a deficit" thing is true and it works, but the healthy deficit range isn't 100%, it's more like 20%. You could push it a bit higher, but it's obvious that 100% wasn't working for him or he wouldn't be in here looking for help.

OP - You're doing great by asking for help

Do what you were talking about and increase your calories. Start at 1200 like you said if you want, but I would encourage you to try 1800 first and see if that works for you. There's no reason to restrict yourself more than you need to. If 1800 is too much, you can always dial it back down.

Talk to some of the lifters in here. Lifting is a great idea and doing it safely is important.

One of the previous posters made a very valid point. Don't completely cut out cardio or you'll be kicking yourself the first time they tell you to run a mile.