I had the same symptoms however not sexually active. the doctor said it is bacterial vaginosis. Only BV burns girls, while yeast itches only does not give burnings. So have a swab done, it takes less than 5 mins and the doctors says if u have bv or yeast. but i think u have bv the symptoms are exactly like mine.
Hope u get over this episode as soon as possible.
Sounds like Bacterial Vaginosis or yeast infection or anything .You should check with doctor before it gets more serious.
Good luck