How can I tell if I have body odor, and what can I do about it if I do? (I'm not a troll, I promise!)?

You just have to ask someone you trust if you smell and then decide to believe them. I hate saying this, but you really just have to make yourself get past this. If you can't use deodorant or perfume or even baby powder, then talk to your derm about what you can use. You are not the only person in the world with sensitive skin. There has to be some kind of safe deodorant for you. Not that I recommend this, but you can have your sweat glands removed in your arm pits...