Please tell us what doctors you have seen? Like AR has said - inform your parents and they can assist you here also.
it is not just if your pituitary gland is malfunctioning that can make you have growth problems. If you have hypothyroidism caused by disorder of the gland itself (autoimmune) it can cause stunted growth .
Have you talked to your parents/gaurdian about going to a doctor and having some tests run?
You have been worrying yourself sick for months now and asking questions, but you have never been to a doctor.
Why?