I have two possible answers: either you are an annoying type of nice guy OR: you don't smell good.
I have rejected amazing guys JUST because they smelled bad. Yes, it is THAT important. Just like a man that smells good can really have a bigger power on us than we would like to admit, the opposite is über powerful.
Shower everyday ( obviously) or more ( if you sweat a lot) and wear deodorant.
Hydrate after your shower as a good lotion not only makes your skin smoothes ( noboby likes cracky skin) but it leaves a nice subtle smell all over you.
REMEMBER: smelling good means smelling good from up-very-close and UNDER your perfume.
Clean your house. I mean: ckean your damn house. Smelly envoronments leave on you a bad smell.
Air out your appartment EVERYDAY. Even if you shower every day, if you live in a stuffy appartment, you will smell. Because yes: stuffiness has a distinct smell.
Don't forget your landry in the washing machine. It gives a weird rotten smell to your clothes that are ON your body. It's gross.
Wear perfume. But not just ANY perfume. Find something that will fit you. Go to a store and find a specialist that will test a bunch of them on you. You will be surprised how different a perfume can smell on your skin. And please: don't wear TOO MUCH. That's just plain ridiculous. Two zitzs are waaaaay enough with any brand.
And of course: mouth hygene is a MUST. ( brush, floss everyday) and always have gum or mints on you.
There. Now you know.