Why do my armpits smell?

i don't understand this.. i shower daily, i scrub my pits, i put alcoholic sanitizer on them because i read that sometimes it's bacteria on your skin that causes the smell.. i put vinegar on my pits after a shower and let it dry completely, i use deodorant, i keep my armpits shaven, i use baby powder.. i do everything i can think of or that i have looked up online but nothing works for me.. this is really getting to me now.. i'm not a dirty person.. nothing else about me smells.. what's up with my pits?!?!??