HELP!!! I dont know whats wrong with me...

Hello all... I am an 18 yr old male and I am currently 5'7" and average about 145 lbs. Last year I was 215 pounds and lost a lot of weight by cutting fat ( i didnt really start counting caloires untill about 5 months ago). Now I am obsessed with counting caloires. Right now I am averaging anywhere from 1000 to 1500 calories a day and I am starting to worry. While eating this number I have maintained a constant weight for about a month (I think). So... if I am maintaining at this low, wouldnt that mean that if I ate any more that I would gain. I exercise everyday (usually run 2.5 to 3 miles, and bike for about 20 min). I cant seem to bring myself to eat more even though I am constantly thinking about food and am minorly obsessed with looking up calorie info and planning meals. I admit that for about 2 months now I have been extremely tired and my muscles feel weak. I am always hungry... even when I eat a meal that would have satisfied me and made me feel full back when I wasnt counting calories, I still feel extremly hungry and then I feel guilty and already start thinking about the next meal and how I can restrict my calories.

Now I know this may sound like a problem... but like I said, I have kept the same weight while living like this, and I dont want to gain any weight. So why do all these calculators tell me that if I slept all day I would need 1700 calories, yet I am maintaining weight with getting 1000-1500 and doing cardio everyday. Any advice or insight is appreciated!!!!

maintaining a certain weight for 1 month doesn't seem all that long to me. if you feel tired and weak all the time, your body is trying to tell you something: it needs more fuel. so eat more calories.

dieting should be about creating a sustainable lifestyle for yourself, and if you are restricting your diet to the point where you think about eating/feel hungry/plan meals in your head all the time, it is only a matter of time before A) your diet fails, or B) you develop an eating disorder. you can't live the rest of your life feeling hungry all the time.

I would say stick with the cardio and try to eat a lot of small snacks (fruit or veggies) between meals every day. that might help with your hunger problem.

First off, you are not eating enough.  Us guys need a minimum of 1500 calories just to run our bodies.  According to the burn meter here on calorie count you should be eating like 2500 calories a day.  You certainly do not need to restrict your calories if you want to maintain your current weight.

You need to start increasing the amount of food you eat.  Do it a little at a time.  You may gain a little weight, but it will come back off.  If you are exercising every day like you say, you are starving your body.

If you start to increase your calories and do it in a healthy way (don't do it with all junk food).  You will not be hungry and tired all the time.

Obviously I'm not a guy, so I can't act like I know it all, but...

The reason you may be maintaining your weight is that, like mick said, you are starving your body.  When your body is starving, it stores all the calories you take in (like fats, complex carbs, etc.) for the future so that it can use them later--it's a survival mechanism we all have that can't be controlled.

 Eventually, not eating enough will catch up to you--your body will store all it can, and then later it will have to "dip in" to those stored resources to use the calories for energy, and then you'll start losing weight again.

Another reason you may not be losing weight is that you are in the process of building up your muscle mass.  Muscle is denser than fat and therefore weighs more.  Since you're working out so much, you're probably building the muscle as you're losing fat from your exercise and restricted calories--which is why your weight isn't fluctuating.

Without enough calories, though, you'll eventually run out of energy to keep working out, and you won't be able to maintain your muscle strength.

I'd recommend upping your caloric intake and redefining your diet based on your goals: if you want to build muscle, then try to eat more lean proteins (like low-fat dairy, fish, chicken, beans, etc) than anything else.  If you want to slim down overall, redistribute your calories in all the food groups at lower levels.