A question likes this makes no sense and is most likely a question that is being asked by someone who doesn't understand the difference between venv or pyenv or the python shell.
Simple Answer: Get out of the python shell. There is no reason to be using the python shell at this time.
You should be using the command prompt or the PowerShell (old school). Then wherever these tools open, use cd (change directory) or cd.. (backwards) to navigate to the C drive. Once there, make a new directory for where you want to play with virtual environments.
mkdir MyVEplayground
Next use cd to navigate to that new directory.
C:\MyVEplayground
Next, create the virtual environment. To make things less confusing, just create the VE using the regular venv function that is build into python.
python -m someName venv
Next, the new virtual environment needs to be activated. When the new VE was created there was a new sub directory created called (someName) and then there were also some more sub subdirectories added.
Move down to the new subdirectory named, someName using cd (cmd or ps)
cd someName
There is no reason to go below this folder. Just remain in this new folder C:MyVEplayground\someName.
Then the Cmd prompt or PS to activate this new VE. Just type the following code. This which will navigate down to the correct subfolder and then activate this VE - all at the same time without having to go there.
.\Scripts\Activate
It would be advised to become familiar with the basic venv function that is built into python before using any of python libraries that involve virtual Environments - such as pyvenv, which it appears you are trying to use. These VE libraries have optional and advanced virtual environment features that are best avoided until after understanding the baked-in venv features.
It's should be really obvious and nearly impossible to miss noticing once this VE has been activated.