Hi, I am 17 years old turning 18 on June and my periods started when I was 14 the it came after 2 months then I had to wait for a year then it came when I tuned 16 it was really abnormal for me cause all my freind keep talking about their periods and I keep telling them I don't be get it then I got tired of so last year (2016 sep) we went to visit obgyn then they said am perfects and normal so I should just wait and everything is normal and that I shouldn't but siriously am really worried and i don't take any pills and am not pregnant so what's up