Constant UTI HELP!!!!!

How do I stop getting constant UTI’s ? I get them so often. I currently have one and it’s so bad this time 😩 it burns when I pee , I nearly want to cry when I pee .I’ve gotten antibiotics from my doctor but they KEEP COMING BACK !!! I try to wear cotton panties as much as I can , I pee after sex I take showers frequently , I keep clean down there , why do they keep coming back ?!? Usually when I get a UTI it doesn’t burn when I pee , this time it makes my eyes water !!! Help!!!