I am a 16 year old male, and recently I've been experiencing urethral pain during and after urination. I also find white discharge that dries yellow on my underwear, and it happens all day. I don't think it's an STI, as I've never had any sexual interactions with another person. I've tried diagnosing it myself, but everything seems to point to it either being either harmless and settled without antibiotic treatment, or an STI that needs immediate attention. I don't know which it is, and I'd rather diagnose it anonymously than talk to my parents about it if it's no big deal. What should I do?