Underarm odor help

My armpits are always smelling! I shower every night, I super scrub them and shave constantly because I’m so insecure. Halfway thru the day I wash them, dry them, and reapply deodorant. They are constantly musty or smell of onions. I have tried sooo many different deodorants. All natural, salt deodorant, spray deodorant, men’s deodorant, and every single female deodorant on the market… what do I do?! I’m so insecure.