I'm 13 and a half and I haven't started my periods. My close friends think I have started because they found my 'emergency pad' in my bag. Only my bestfriend knows that I haven't started and sometimes we speak about this at break and I just sit there awkwardly I have loads of moodswings and have had for about a year now! I can be finer one minute and angry the next. I get really worried because I find it uncomfortable to sit down because of discharge which I have had for about a year aswell! :(
Dont worry some girls dont start there's until 15 but im sure yours will start soon now.