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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.