Why am i not floating?

Because I am heavier than air

That depends on what you are not floating in.

- - If you are not floating in water, then either you are not IN water at all,

or else you are in water and your density is greater than 1 gram/cm².

In the latter event, you are sinking like the proverbial stone, and headed

straight for Davy Jones' locker without passing GO or collecting $200.

- - If you are in air but not floating in it, then likewise, your aggregate

density is greater than that of the air around you. This is quite definitely

the case if you are any more dense than a balloon full of hot air.

- - If you are not floating lazily away from the Earth's surface, but rather

standing or lying upon it, then the gravitational forces of attraction between

you and the Earth are obviously zero. We must conclude that you are the

most successful Weight Watchers customer of all time, because your mass

is exactly zero.