I see. The thing is, after the MC is attacked by the Snake Girl, you have to interact with one of the hanging carcass on the wall (The Humar or Monster Penis Selection). After doing the selection, you have to return to the zone where you were jailed, and then return to where you started (The Bag Head Guy's Camp). After that, you have to go straight and enter the road that is in front of you.
If you get lost, you can press the Key Tab to get an indicator of where to go.
You can also try this guide if you keep having problems: https://mega.nz/file/IuhRWSpR#5GkBkJ4d5hZc2eeLVQMgwNkoAn-sWhne2xKHDy28SUc