UTIs and sex

I'm 16 and recently had lots of UTIs. Waited 6 months to see a specialist and within 5 minutes of seeing the doctor he told me I had honeymoon cystitis and told me to leave. I felt stupid and I think he blew me off because I'm 16 and I'm not a virgin. I did research and from what I know it's not as common as it seems. What are your thoughts. Please help me out!

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