Water Infections (UTI)

I'm 17 and I've been suffering for over a year now with extremely painful UTI infections. I've visited my doctor on numerous occasions and each time he have gave me a different type of antibiotic. Although the antibiotic have cleared my symptoms at the time they continue to come back, I would say I have had at least 11 this year. Has anyone else suffered from this or does anyone have any home remedies that you think may help?:(