hello, I would like to start by saying that I am 21 years old and I've never had a period not caused by birth control. My gyno said my estrogen is very low, and my FSH levels are high (I believe they were high, They may have been low.) Anyway, my 10 year old sister started her period today and I can't help but feel resentment toward her. Shes a little kid, why should she get a period when I don't? I know she cant control it, but I'm still very upset, Anyone else experience anything similar?? Any advice??