Please help me out . what could this possibly be?

A Few weeks ago I've been experiencing some itching down there and its nt that bad but it still a Deal, I kinda have this really bad odor smell down there (eww I knw, but I shower every day and clean btw) also like before I pee I get this kinda like sting and after too but then it goes away I don't know if its a UTI yeast infection or StD :/ I'm currently using vagasil and it helps with the itching and odor I'm thinking of using monostat 7 day and see if that will cure it . I really want to know what this is.! And get rid of this :/ Will monostat cure it without having to go to the doctor ?