Breathing problems

Patient: For the last 11 months i have found it very difficult to breath properly.I feel as if i can never get enough oxygen into my lungs. I have breath very heavily if i want to feel a bit better for a second or two.I am not sure what is wrong with me, i am a 15 year old girl and weigh a bit less that 60 kg and i am average height. (anywhere from 170cm – 155cm)This happens everyday, not just every now and then but 24 hours a day. the only time it stops is when i don’t think about it.