Can't start app...

[AlvaroLuken]

I keep getting this:
(newenv) aluken@MacBook-Pro WorkoutApp % python3 manage.py runserver
Traceback (most recent call last):
File "manage.py", line 10, in
from django.core.management import execute_from_command_line
ModuleNotFoundError: No module named 'django'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "manage.py", line 16, in
) from exc
ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?

Any help? I've tried everything... Really want to try this out!