No, you cannot hear your own voice in a vacuum. In a vacuum, there is no medium for sound waves to travel through, as it is devoid of air or any other substance. Sound waves require a medium, such as air, water, or solid objects, to propagate and transmit vibrations.
When you speak, your vocal cords create vibrations that transfer to the surrounding air molecules, generating sound waves. These sound waves then travel through the air and reach your ears, allowing you to hear your own voice.
In a vacuum, without any air or other medium, there are no molecules to vibrate and carry the sound waves. As a result, if you were in a vacuum environment and spoke, you would not hear your own voice as you do in normal atmospheric conditions.
It's important to note that being in a vacuum without proper protection would be extremely dangerous and life-threatening. Humans cannot survive in the vacuum of space without a spacesuit or other specialized equipment, as the lack of air pressure and oxygen would lead to rapid suffocation and other severe consequences.