17 year old male ekg, blood work, peak flow meter, chest X-ray, echo, all normal still have chest discomfort at times short breath, BP 117/80?

Asthma. It's great that all your testing has been fine, but you may need more specific testing to elucidate the cause of your symptoms. For example, for asthma the peak flow in your baseline state may simply not be accurate enough. The best test for this would be a pulmonary function test with a methacholine challenge. And for the heart (unlikely but possible), stress test better than 2D Echo.