I am 16 years old now and I need help.I can't run long distances or even a lot of spirnts.I am very athletic and look like it to but its like a 300 pounder stuck inside of my athletic body.I need help, I have been to the docter about asthma but he can't find anything there and my parents say mabye im just not built to run.I don't know if it's just a mind thing but I can't get in shape either. It just feels so uncompfortable and I start to breath harder and hurt until I just stop.When I was little I could run with the best of them but ever since i was 11 i just hate running and stopped being able to keep up with the rest of the group It is sooo frusturating, does anyone know why I can't get in shape and feel good when I run.I get soo scared when it comes time to run at practice because I need another excuse to get out of the run or just stop in the middle of it and look embarased. I have faked injury's for running and i want to stop and just be able to run with the rest of my teamates. i play lacrosse and soccer and i need help fast, lacrosse is right around the corner and im still the slow poke.