Chest pain since april and i searched up my symptoms and it said many things such as lung cancer and heart disease.16yr 141lbs 5,4ft the pain comes and goes and last for a few seconds and can be pointed to(no accompaniment pain.i dont smoke/drink?

Chest pains: Very fleeting, sharp chest pains, especially if provoked by a deep breath, are usually not caused by heart or lung pathology. A common cause is a pinched intercostal nerve or muscle that runs between 2 ribs. Another possibility is an inflamed costochondral joint at the junction of a rib and the breastbone. There may be associated tenderness. I doubt a serious cause, but get examined by your MD.