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There is nothing to get stressed. You might be having urinary tract infection, which is very common in girls. You take care of your hygiene, especially during periods and frequent change sanitary towels and wash the area with plain water as many times as possible. Secondly, increase the intake of water and also take cranberry juice three to four times a day. It will help relieve the pain. If this pain does not get relied on by these measures, then you might need antibiotics to cure the infection. But, hopefully, these simple measures would work out for you.
Hope it has helped you.