Girls just condition?

I need give support to because some girls in my class own starten thier peiords but I havent. I get constant cramps when i amble and run. and my brests have be growing HELP the same entry is happening to me! its ok of late wear pads only in defence thats wut i do!! and every one gets in attendance period at different times!
so what? that really doesnt be determined anything. except your period is going to come soon. once you start spotting it will come! trust me, dont be jelous of them have their periods - its not fun ...