@Anonymous028 just use deodorant all the time.
I also have strong humour, since I was a child. I try using deodorant all the time, though, not all deodorants did it for me. Right now, I use Rexona Clinical (in cream) whenever I'm outside; when I'm only at home I use a random deodorant.
If your partner's family hasn't said anything, don't fret over it. Just make sure to bathe daily and use an appropriate deodorant when you're outside or having visits at home.
Do not think about what they could've thought or if they smelt you or not, just take more care about yourself. If it's truly bad, go to a dermatologist so they can suggest you a special deodorant for your condition.