I also could squeeze a tiny bit of substance out of my nipple at your age, although mine was clear. I cant say I ever went to see a doctor then as it didnt even cross my mind to. I dont know what was wrong either to cause that. But I have had blood tests not long ago where all was "normal" to quote the doctor. If I were you id go see a Doc. quick, you never know, he might be able to give you something to reverse the gyne before its too late - like it is for me.