estrogen levels

Hi, does anyone have experience dealing with low estrogen levels. I'm only 29 and just found out my level is 13 pg/ml. Which could be the answer for a lot of symptoms I've had misdiagnosed for a long time. But I'm worried about the cause. Am I already going into menopause? :( I know there are a variety of causes. I haven't had kids yet and now I'm scared I won't be able to.