Strictly speaking, there's no need to create a family group. You can simply restrict your own account with parental control:

1. PlayStore ->Settings->User Controls.
2. Set parental controls ON by having someone type a PIN for you.
3. From the category list, set app restrictions as you like.

Strictly speaking, there's no need to use Google Family Link at all. You can restrict your own account using Google Play Store parental controls:

1. Play Store -> Settings -> User Controls.
2. Enable parental controls by having someone type a PIN for you.
3. From the category list, set whichever app restrictions you'd like.