Is this an STD?

someone please help me, i am sexually active, and a couple days ago i had this reaction, it burns alot when i pee. it hurts to sit down and everything stings. i cant walk too fast. i dont have anything in my mouth thouggh, so can it still be an std? yes we also had oral sex. any way i can treat tjis without my parents finding out? i just need comfort right now, i dont lnow what to do. thid is stressing me out so much.

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