Unable to extend User model and see it in Django Admin

I've tried many things, but I'll write what I currently have implemented.

admin.py

admin.site.register(User, UserAdmin)

models.py

class User(AbstractUser):
 phone = models.CharField(max_length=40, unique=True)

settings.py

AUTH_USER_MODEL = 'user_text.UserAdmin'

I do `makemigrations` and I'm getting this error:

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 337, in execute
    django.setup()
  File "/usr/local/lib/python2.7/dist-packages/django/__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/lib/python2.7/dist-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models()
  File "/usr/local/lib/python2.7/dist-packages/django/apps/config.py", line 202, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/home/binny/Development/politikal/user_text/models.py", line 7, in <module>
    from django.contrib.auth.admin import UserAdmin
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/admin.py", line 7, in <module>
    from django.contrib.auth.forms import (
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/forms.py", line 22, in <module>
    UserModel = get_user_model()
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/__init__.py", line 198, in get_user_model
    "AUTH_USER_MODEL refers to model '%s' that has not been installed" % settings.AUTH_USER_MODEL
django.core.exceptions.ImproperlyConfigured: AUTH_USER_MODEL refers to model 'user_text.UserAdmin' that has not been installed

Some nice people on the internet have advised to remove the `AUTH_USER_MODEL` line in `settings.py`. when I remove that line and run `makemigrations` I get:

auth.User.groups: (fields.E304) Reverse accessor for 'User.groups' clashes with reverse accessor for 'User.groups'.
 HINT: Add or change a related_name argument to the definition for 'User.groups' or 'User.groups'.
auth.User.user_permissions: (fields.E304) Reverse accessor for 'User.user_permissions' clashes with reverse accessor for 'User.user_permissions'.
 HINT: Add or change a related_name argument to the definition for 'User.user_permissions' or 'User.user_permissions'.
user_text.User.groups: (fields.E304) Reverse accessor for 'User.groups' clashes with reverse accessor for 'User.groups'.
 HINT: Add or change a related_name argument to the definition for 'User.groups' or 'User.groups'.
user_text.User.user_permissions: (fields.E304) Reverse accessor for 'User.user_permissions' clashes with reverse accessor for 'User.user_permissions'.
 HINT: Add or change a related_name argument to the definition for 'User.user_permissions' or 'User.user_permissions'.

I've been spending a day on this, am really lost, and would love some direction. 

Thanks!

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