I created a new user, and this user is recognized as a root user, how do I return him back to a normal user

I execute a normal command to create a file and it tells me access is denied, after that I use Sudo the file I created belongs to the root user and not to the user I created whoami returns user1 ls -l to the file i created shows root root and not user1 user1 all the simple command permission denied i tried to configure sudoers but nothing change