All this symptom-
1. Increased Frequency of urination
2. Burning sensation during urination
3. Pus in urine
Indicates a URINARY TRACT INFECTION
which is quite common in female and at your age.
so, do these test-
a. Blood for TLC
, DLC, Hb
b. Urine for R/E , M/E
c. Urine for culture sensitivity(depending upon the R/E, M/E result)
Consult a doctor and certainly he will initially start some antibiotic may be- NORFLOXACIN
Dont worry it will be alright within 1-2 weeks.