You are very open with people you don't know.
'Aperto' = a-PER-to. 'Conosci' = co-NO-sci, with 'sc' making a 'sh' sound before 'i'.
Use this as a compliment that acknowledges someone's social ease. It is both a compliment and a subtle invitation to continue being open. It works well after a conversation where someone has shared personal thoughts or stories quickly.
'Aperto/a' in the social sense means 'open', 'outgoing', 'willing to share'. The phrase 'con le persone che non conosci' uses the indicative 'conosci' because it is a statement of fact rather than a hypothetical.
Hai una facilità nel parlare con la gente.
You have a natural ease in talking to people.
'Facilità nel' + infinitive — describes a natural talent
Sei molto socievole.
You are very sociable.
'Socievole' is the direct Italian equivalent of 'sociable'
Ti metti a tuo agio subito con tutti.
You immediately make yourself comfortable with everyone.
Describes someone who is naturally at ease socially
While northern Italians tend to be more reserved in initial encounters, southern Italians are often known for immediate warmth and openness. Regional character differences are a frequent topic of playful self-analysis among Italians. A Sicilian may joke that 'a Milan, it takes a year to become friends; in Sicily, you are family in five minutes'.