self-confidence
US /ˌselfˈkɑːnfɪdəns/
UK /ˌselfˈkɑːnfɪdəns/

1.
autostima
a feeling of trust in one's abilities, qualities, and judgment
:
•
Her self-confidence grew with each success.
La sua autostima cresceva con ogni successo.
•
He lacked the self-confidence to speak in public.
Gli mancava l'autostima per parlare in pubblico.