I really need help please help me!?

i am a 17 years old i have had no cases wrong with my lungs. or my chest and we checked my heart so theres nothing wrong with any of that but for the last three months ive been having slight chest pains. they move around like some days theyll be in the sternum next upper towards the collar bone and sometimes below. it does not hurt when i breath nor when i run. my mucus is yellowish but most of the time clear it was bloody but not very like very lightly but went away but when it was around it was very smelly like bad breath or those pleb thigs you get but they have gone away. i have no loss in appetite and i feel rather fine. its not a crippling hurt much more like a annoyance i dont have acid reflex and i am not running a fever or anything i feel perfectly fine and seem perfectly fine the only thing is the pain in my chest i have looked for any kind of similarities and found nothing. i look at pneumonia and bronchitis and even lung cancer. nothing seems to match my symptoms. so could somebody give me any kind of advice or diagnosis. i cant go to the doctor i have no insurance so please try your best to tell me what is wrong thank you!