'Unable to login with newly created user in PostgreSQL

I am unable to login with a newly created user in PostgreSQL 14. I execute the following commands in my command prompt

psql -U postgres

then i enter my password and then see this

psql (14.1)
WARNING: Console code page (437) differs from Windows code page (1252)
         8-bit characters might not work correctly. See psql reference
         page "Notes for Windows users" for details.
Type "help" for help.

after this I enter

create user admin1 with encrypted password 'admin1';

after this when I close the command prompt and try to login

psql -U admin1

and enter the password, it gives me the following error

psql: error: connection to server at "localhost" (::1), port 5432 failed: FATAL:  database "admin1" does not exist

I dont know why this error occurs and why it considers my 'admin1' user as a database



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