I am 16, i weight about 118 lbs and i am 5 foot 2 and 1/2.. im trying to loose weight as well and nothing is happening, i exercise everyday and i've cut down on junk food so i consume around 1'400 calories..
It depends on how much muscle you have. But for your age and height, you sound like the perfect weight. I think from about 110 lbs - 120 lbs is fine for your height.
You're definitely not overweight, so don't worry about trying to lose weight. If you don't like how your body looks, just do some toning exercises like crunches, sit ups etc.
Well I have very small bones so when I was 5'3 and 110 lbs I felt a bit chubby and I wasn't very fit lol so it depends on you. If you want to tone up and lose a bit of fat that's fine but you are at a healthy weight for your height at 118. :)