Does it feel like someone covered your face with a pillow, or similar to being underwater, etc.
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Not only is there no oxygen, there’s also no air. This may seem like a pedantic difference but it really isn’t. If you breathe pure nitrogen gas (which is what air mostly is), you will feel completely normal until you pass out and die of asphyxiation. In space, there’s no nitrogen gas. There’s no air pressure at all. The internal pressure in your body would face no resistance and would most likely cause your lungs to collapse, though I’m not aware of any scientific studies to that effect.
In all likelihood, trying to breathe in space would feel like your lungs collapsing.
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