Seeing an orthodontist is advised.
I saw the dentist but he would not refer me to an orthodontist because my bite is not that bad
i feel exactly the same as u, my upper jaw is too small making it almost impossible for me to give a natural smile. and it is, so hard to live with. Ive also stopped going out as much, people call, but i just never feel like it.
just remember, for the times when u are too depressed to go out. make sure you do something productive at home, like learn something or train a skill...anything really. This will atleast give you some sense of achievement instead of wasting away infront of a TV. I play drums, guitar, paint, dance (yes dance!) work-out or at last resort read. this atleast stops me from wasting the hours i have chosen to be at home.
Im just 17 aswell so we're in the same situation really, but im a guy so people dont expect me to smile as much. i guess they just think im a hard nut who never smiles...but inside i do want to smile.
ANYWAY best wishes
jack