need advice

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my pee has smelled really bad for like 2 months straight. my mom said it couldve been my diet like maybe eating onions or etc. but i dunno what it is and im scared really. what should i do and what doctor should i go to? ive never really made my own doctors appointments so what should i say to them? ive also never been to the gyno which i know i need to do. i only became sexually active in the last year with my boyfriend and im 19. any advice to that too? totally stressed