Weird smell? (TMI!!)

Sorry ladies.. I just have to ask. Has anyone ever have a very strong smell down in the lady parts? Not fishy, but the closest thing I can compare it to is a vinegar kind of smell.. It's not it itself it doesn't seem and it isn't all the time. It seems the CM on my panties that smells funny. I asked my bf and he said he never smells it on me. Am I crazy? Anyone ever have this????? Please help.:(