J.:
Despite what other replies have mentioned you are not to young for the change. I've had 2 friends that went through it, and they are younger than me. I am 41. When did your mother and other females in your parents families go through it? That would be good to find out.
I can tell you it may be good to an OBGYN, and be checked out. I cried a lot in my early twenties, for no reason. Sometimes 5 minutes, sometimes 5 hrs.My partner would ask what he did. I'd say nothing, I didn't know why I was crying. It turns out I needed a B vitamin. I think B6, but can't recall. I can tell you that it was a Female OB that easily pinpointed my deficiency. Within two weeks, the unknown crying spells stopped for me.
Good luck finding a knowledgeable care giver (consider a Homeopathic, Natural Path, or Biofeedback practitioner, in additional to to instead of traditional MD's)that will hopefully guide you to resolving your issues without drugs, which in the long run could make things worse. And I can speak from horrible experiences.