Constant Hunger, few questions

So im 18, f, 110-115lbs, 5'3.

I workout every morning for 20minutes (Circuit Training) i burn around 160 calories.
I typically eat between 1360 and 1500 calories a day, ive been sticking to this for about 2months now and maintained my weight, i feel like im seeing tiny differences, nothing major though.
lately ive been getting constant hunger pains, usually within half an hour of eating. My analysis is usually around: protein=30% fat=20% carbs=50-60%
Few questions, Is this a sign of my metabolism getting faster? should i be upping my calories? also what about the hunger pangs, ignore/listen to them?

thanks

You're not eating enough for your age (min 1500); you're already at a good weight for your height and you're still growing well into your 20's.

That is why you are hungry, listen to your hunger.

(hoping someone will come in with the recommended weight for your height, I just know you're taller than me and already 10lbs below my goal.)

Ya - I think you are at an optimum weight also.  You have to take your bone structure and everything into consideration as well!  It's hard to say exactly what you should weigh but if I were you...I would try to tone and gain muscle - you will weigh more...yet have a leaner longer look if that's what you are going for. 

I would eat at your maintenance cals and body build a bit and see if you like it.  Your 18 so you have metabolism on your side!  Try not to concentrate on the number on the scale - I am 5"4 and was 118 at my lightest but 124 at my smallest!  Just by being fit and working out with resistance!  Good luck! 

http://www.bcm.edu/cnrc/bodycomp/bmiz2.html

Check your details through the above site which is aimed at the under 21s.  You'll find that at 115lbs your BMI is 20.4 which is about as low as you reasonably want to get if you don't want to start experiencing medical problems e.g. loss of periods.

Your exercise regime combined with any other moving around you do during the day probably gets you into the 'light to moderate' activity bracket and the calorie recommendation for someone your age & size is 1950 - 2250 per day.  So aim for that amount since you don't need to lose any weight.  If you're maintaining on 1300-1600 your current weight is probably too low and you're at risk of malnutrition in the long-term.

Choose your foods carefully... complex, unprocessed carbohydrates are more filling than sugary, starchy carbohydrates, for example.  More fat (25-30%) would also add to the satiety of your diet.   Low fat diets are very unsatisfying.

Hello, so i think its been about a week since ive been eating at 2,000.

I decided to take my measurements today everything was still the same however it seems ive gained half an inch in my calves! also a 2-3lb gain. Obviously its very distracting but im curious as to why. Is this fat or would my circuit training have any affect? im only using 5lb dumbbells.

Also having restricted my calories for awhile(a year) and still being 18 is it possible for my metabolism to bounce back?

Thanks!