Can't breathe when jogging for short time?

I'm not overweight, but even when I try jogging for a very very short amount of time I get out of breathe. I tried doing track earlier in the year but quit after a few days because it was embarrassing to always be in the back during practice. I can jog for a short time but if I keep pushing myself I feel like I'm going to have a heart attack or pass out. Also, when I was doing track I wanted to do something short like the 100 yard dash because I've always been a fast short distance runner. But when I tried it, I got about 10 yards and felt like I was going to die. After I got home I tried doing a sprint down the street and did just fine. Could it be something about being around other people? I am a 14 year old girl, by the way. I don't think it's something about "not enough lung capability" because I have played the trumpet for 5 years.