MacBook won't recognize internal speakers... Cannot play any sound, Help!!

My 2017 12-in Retina MacBook runs Big Sur.

The other day I hooked up my MacBook to a projector through a USB-C adapter (bought from Apple) for a while, as I've always done before and had no issue. The next day, I tried playing a video from my Mac and no sound was heard. When I press the volume keys, I cannot modify the volume (see picture below).

When I go to Sound Preferences, my internal laptop speakers do not show up on the list of output devices (see picture below). What do I do to fix this?

I have tried restarting my laptop multiple times. When I use Bluetooth earphones, I can listen just fine, it's really the internal speakers that are the issue.