Stuck with a girl who is blackmailing me by keeping my private message

im 17 years old nd studying 2nd puc. This was my case ,plzzzz help me out . I was speaking a little closely to a call girl nd i also sent her 2k through mpesa app but she told she did not receive it nd said dat the number she had given was her friends but she never told dat in the beggining when she was asking for money. I was tensed dat i lost my 2k but she again asked 2500 which i refused to pay nd i once asked her for my 2k decently and she replied telling if u give me 500 i ll give.back ur 2k but i told i cant ask my parents again so u only send 1.5k instead of 2k nd den all of a sudden she started demanding 10k and if i did not pay she told it will be a problem at my house for me . And i think dis is because she got to know dat i stay with my parents. So wat can be done to this sir? Im very afraid.