Why does the inside of my vagina lips smell like fish, my discharge doesn't? And it doesn't itch or burn either, help

Bacterial vaginosis? Probable bacterial vaginosis, maybe trichomonas. Both cause fishy odor, but BV is more common and typically has less discharge. It's a bit puzzling the discharge itself doesn't have odor, but these still are the best bets. See your doctor for examination, testing, and treatment. You'll need STD testing as well; trichomonas and BV often accompany gonorrhea or chlamydia.