Hi Welcome to HealthcareMagic It appears like you have urinary tract infection. It is quite common in young woman who are sexually active. It may be due to poor hygiene during periods, tight underclothing etc.. I suggest you to see a doctor for an examination who may ask you to give urine sample for routine microscopy and culture. you may need a dose of antibiotics. Make sure you drink enough amount of water and do not irritate the mucosa , avoid soaps over the area and wear loose cotton under garments . You can also take urinary alkalinizers which will help to relieve burning sensation . Take care.