They are all there. But if you could hold your hand out, there would be nothing. If you are a deep sea diver and you go to the bottom of the ocean, the pressure would be incredible. The pressure is enough to crush submarines. If you jumped out of the sub, your whole body would be crushed under the enormous pressure of the deep water.
Space is exactly the opposite.
Since there are no molecules in the vacuum of space there are neither atmosphere nor pressure. When there is no atmosphere all of the molecules in the area want to spread out as much as possible. So if you were on a space ship and stepped outside, you would not be crushed. Instead you would blow up like a huge balloon as your molecules began to spread out. Eventually you would pop.