This is my 5th urinary tract infection

Tuesday evening I started feeling like I was getting yet another UTI so I started drinking more and more water. Since yesterday was a holiday I couldn't reach my doctor, so I called this morning. I have a lab appt for this afternoon. Based upon how I feel I am about 100% sure this is another UTI and this makes the 5th one since Feb 18. I feel like a complete failure as I always take the complete course of antibiotics and do what the Dr tells me. I don't want to live on antibiotics every month as they are hard on my stomach. I just don't understand WHY I keep getting these infections. I don't smoke or drink alcohol or soda. I have to be doing something wrong.