Uggh When will I have my first period!!!

I am 13 and I still haven't had my first period. I am pretty athletic and 5'5 and about 123 pounds. I have been having white/creamy and watery ish discharge for about a year and 1/4 and have been having terrible gas and bloating and occasionally diarrhea. But the other day I woke up with a couple brownish spots in my underwear insted of the creamy white discharge. I didn't think anything of it, then later on I got another brownish spot, then later on that day i found a dark yellow spot. That day I had lower bak pain and stomach cramps, then that night I woke up with one tiny brown spot, then the next day the discharge turned yellow, then white and it has been white for about two weeks. Now I have been having alot of bloating and gas and stomach pain and a few pimples and alot of pubic hair and leg and arm hair, do you know when my period might come? Please? I really want it and I have smallish breasts that seemed to get a little bigger, size 34a. I also hve been very tired and eating LOADS of food, I get angry at the littlest things, so can you please comment and tell me if you know if or when I will start my period???? Thanks, Megz