Girl, you have either a BLADDER or URINARY TRACT INFECTION. This is signaled by the the frequent urination and the pain you feel each time.You may have the burning sensation that will make you feel like you have to urinate, but will not be able to. This MUST be checked out by a DR that can run a test and 9 times out of 10 they will give you an antibiotic to treat the infection.DO NOT wait too much longer to see a DR; this can become serious, with a fever, the chills, and can even lead to severe back pain. Sorry, but yourGrandma is wrong, it is not a yeast inf. You are right that you would have the thick white(cottage cheese looking)discharge if you had one. Please be checked by a DR soon.The cranberry(real) juice is great for preventing urine infections, yogurt w/live cultures labeled is for yeast infections.To help prevent any of these infections try to wear cotton panties that will let air"breathe" and good hygiene,especially if you are sexually active.E-mail me anytime if you have any more questions about stuff!Good Luck!