What causes someone to pee every 10-15 mins? why doesn't it all come at once? why is that i feel like i'm done but 10 minutes later i feel the urge to

UTI: Frequent voiding, painful voiding, or having the constant urge to go and only voiding small amounts, is often due to a urinary tract infection. You can get test kits for this over the counter. Or see your doc. If left untreated, these infections can become very serious.

UTI? OAB?: In women, the most common cause probably is urinary tract infection (UTI), followed by overactive bladder (OAB). Some STDs occasionally could be responsible, e.g. chlamydia or gonorrhea. There are other conditions as well, such as interstitial cystitis. Some drugs could have this as a side effect. See your doctor, who might refer you to a urologist if the diagnosis isn't obvious. Good luck!