In order to hear your voice through the speakers, you need to turn on the "Monitoring" feature in Windows.
Extract from windows.microsoft.com
You can use the line-in connection on your sound card to connect a portable music player, microphone, or other audio input device to your computer.
Most sound cards have at least one line-out port to connect speakers and a line-in port where you can connect an audio input device.
However, the line-in connection to your sound card is muted by default. This means that if you plug an audio device into this port, it will not produce any sound on your computer until you enable sound for the line-in connection.
To enable sound for the line-in connection: