Memory loss and worsening cognition?

I am a 13 year old girl and am greatly concerned by the fact that there may be a disorder of sometype worsening my ability to analyze ,as well as comprehend very basic things from my education to my social life. I constantly need to be reminded of things, as i can forget a whole day. I know for a fact i am not sleep deprived or hypoglycemic. This cognitive impairment may ruin my chance to sucess. I feel as if im a moron everytime i study, because i know i could get it,andi would forgt completely the next day. I forgot what point i was getting to. So i guess ill just post this