Does it feel like someone covered your face with a pillow, or similar to being underwater, etc.
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You can’t take a breath in space.
The air in your lungs will flow out whether you like it or not. The whole system is not designed to fight against a one atmosphere under pressure.
Supposedly your beast chance is to let the air escape and not fight it by trying to hold your breath or breath in. Once all the air is out you are somewhat safe-ish and can try to breath, but it won’t work.
There heaven been a whole lot of people who have tried to breath in vacuum so what that would feel like is not clear.
This is not something you can really test ethically and accidents in vacuum chambers and similar are thankfully rare.
Presumably it would feel a bit like trying to breath very thin air only much more so. Not much like drowning or being suffocated.
One would assume that it is in any case only a very brief sensation and overshadowed by panic and the sensation of everything else that goes wrong.
Our bodies are evolved to have instincts to deal wit drowning and being suffocated. Those instincts don’t work as well for things like inert gasses and presumably would also lead you astray when exposed to vacuum.
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