What Causes A Delayed Period With Vaginal Itching And Discharge?

I just wanted to know if there is something to worry about because my period is late and it is not the first time.i should have had my period on 13th,its 18th today n there are still no signs of it..i know i should not be worried as it is not that late but i have missed my periods before also (2 or 3 times since my period cycle is started)i m 20 years old n this time there is itching in my vagina n some white thing which is not fluid also comes out at times from my vagina...i recently had fever also.kindly let me know what should i do because i am too ashamed to tell all this to my mother.reply me soon.