I m getting irritation in my vagina when i go to washroom n also there is a feeling that i have to go to washroom again n again but d urine didn't come?

UTI? STD/STI?: An "irritation" in your vagina could represent a urinary tract infection, sexually transmitted disease/infection, or some other condition, eg yeast infection (doubt atrophic vaginitis given your age). The fact that you have to "go to washroom again n again" suggests a bladder/kidney infection, especially if it hurts to urinate (pee). Best to go see your family doc to get checked out.