breathing problem

I don't feel well while breathing,
I don't know it might be something linked to the trachea.
but i do find it hard inhaling air sometimes, and while exhaling i don't feel that my lungs are fully empty of air so i have to force some air out through my mouth.
I don't cough a lot and I'm only 16.
I wanna go to a doctor but i wanna know what's this first!
thank you.

[David Tinkelman, M.D.]

That you “don’t feel well while breathing” can be quite worrisome.  The first step would be for you to have your lungs examined by your primary care physician and for that physician to order a breathing test, preferably with the measurement and recording of flow-volume loops both while breathing in and while breathing out.  

This could be as simple a problem as asthma.  Rest assured that this is not a serious problem and very likely to be a treatable one.

Good luck