Itchy "area"?

since i was about 9 i've had l distarch just clear but sometimes light yellow and now i'm 17 this past september though i got really itchy in and around my vaginia, so my mom got me some monastat and it went away and then after the medicine stopped draining out once again i have the drainage and for about the past month i've had some itching not all the time just here and there and some days the drainage is worse... last night the itching was reli bad, but only for like a half hour to and hour. but today i've only had a little itching some days i'll go without itching all day... wut could be wrong??? i DONT have and STD i KNO that for a fact and i wear cotton panyty's that arent tight is this drainage normal??? and the once in awile itching???