Hello,
From the symptoms it looks like chafing and urinary tract infection. Urinary tract (which consists of the kidneys, ureters, bladder, and the urethra) infections are very common in young women. Symptoms of UTI are frequent urination, burning sensation during urination, passing of blood in urine and even fever.
I suggest you to get your urine examination and urine culture done from a urologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.