Why do my shorts and underwear stink when they get wet?

I’m a little 17yr old female and sometimes if my shorts or underwear get wet they smell funny? I can’t really explain it but it’s kinda like old water and maybe pee/discharge . I don’t think I have an infection because they usually don’t smell like that and not even always when I get wet just sometimes. Maybe not... show more I’m a little 17yr old female and sometimes if my shorts or underwear get wet they smell funny? I can’t really explain it but it’s kinda like old water and maybe pee/discharge . I don’t think I have an infection because they usually don’t smell like that and not even always when I get wet just sometimes. Maybe not wiping good enough? (I can’t affird very good tp but do the best with what I have without hurting myself) I’m clean but maybe it’s just old stuff hard to get rid of? No hate pls I know it’s kinda gross
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