I might have a urinary tract infection; the problem doesn't end there : /?

Not necessarily true. You can go in the room alone and the doctor won't tell your parents when you tell him or her that you are active. But really, they aren't going to need to go up there to diagnose a UTI or bladder infection. You also should not put your health on the line. Do you use birth control in any form? Because I can guarantee your parents are going to be more upset if something happens and that is how they find out than if you go to them and ask to be put on birth control or something. Keep in mind the pill does not protect against STD's,