please help me! :'( no period over 3 yrs

hello
I am 19 years old teenager. I did not had my period almost 3 years,( My period begin when I was 15) I never had sex or anything.. I am not in any stress or upsad, i look very healthy and i eat healthy..I do sometimes exersize like normal people.. I never had any health problems and my family.. and my doctor did many tests but she did not know why I was not having period so she send me to obgyn and she did couple test and she also dont know I believe beause she told me that she will call me and let me know but she never did so I did call her but she is always "busy". I dont want to be mean but this is my heath, and I dont know what is going on in my body?? I am very scared now, am I gonna die or will I have kids when i get married?? and why do I have this roblem?? Now iam getting streesed about this and I dont know what to do about my period?
We can not give medical advice here. You need to see your primary physician who may refer you to a specialist.

I am very sorry that this is happening to you. You sound very frustrated and I certainly can't blame you. Unfortunately, we cannot give medical advice here and it is necessary to close this thread. I hope you will be able to get some answers from a health care provider whom you can see in person.