Is it premature menopause?

A brief history: I've always been really irregular. I started my period when I was 10. When I was about 14, I started taking the pill to help regulate my period. When I was 18 I decided to get implanon. I never had a period while on it and it seemed to make me have have more problems with pms, which I thought I was odd since I didn't have a period. I had the implanon taken out this past July after only having it in for 2 1/2 years. What lead me to have it removed was I was clotting and passing huge blood clots for a few days until I could see my gynecologist. I started taking the pill again at the beginning of August. Recently, I've been experiencing things I've never quite figured out. I decided to search a few things I was experiencing, and I found a list of premature menopause symptoms. I have never read something and be utterly shocked to my core, like I was while reading that list. I'm only posting to hear other stories and opinions of people who have experienced or gone through this, or who could help give advice.