Is there a way to test if smell bad

I’ve always been talked behind my back back that I smell bad. Over 10 years ago I found out someone said I smell like 💩. I shower twice daily and drink water. I’ve been told that I smell like rotten egg and musk. Well, low and behold the musk smell was coming from down there and boob sweat. I use all over body deodorant for those places which seems to work. But where Is this rotten egg smell coming from. My doctor doesn’t seem to know wtf I’m talking about,(seeking a new doctor)