Itching... well there are several factors that cause itching,most common at your age being fungal or bacterial infection. Sometimes dryness around the area might also cause itching,so make sure its not so dry. Taking care of yourself by maintaining hygiene,wearing 100% cotton inner wear and frequent changing of sanitary pads. You can apply Cotrimazole creams and gels or use ciprofloxacin/metronidazone oral and vaginal gel but i would suggest you to visit a gyanecologist or dermatologist for better diagnose and treatment.