This mod adds the Painfully Shy trait to The Sims 4.
In CAS give your Sim the Painfully Shy trait. Conflicts with Outgoing trait, Party Animal Trait, and Insider Trait.
This trait unlocks new social interactions and menu.
Using the Sorry I don’t like to talk much interaction will give your Sim the Socially Invisible buff that will make them feel uncomfortable.
When they use the It’s hard for me to open up interaction they’ll get the Quiet buff that’ll make them feel embarrassed.
When they are with a sim they don’t know very well, they’ll get very uncomfortable from the Painfully Shy buff.