Smelling bad

I hope this is the right subreddit; sorry if it’s not.

Basically, I smell bad at school—only at school. I shower every single day, scrubbing myself as much as I can, and I've even started reapplying deodorant and perfume at the beginning and end of every class. I’ve been extremely paranoid about it, which is why I reapply so often. But I can still smell myself, and it’s driving me insane. The weird thing is, when I lean in and actually sniff myself, I smell great. Sounds odd, but even my armpits smell amazing. I know it’s me because the smell is always with me. I don’t understand what’s going on. How can I make myself smell better? Is there an explanation for this?