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Language barriers occur during self-confidence building process while trying to use a new language. This qualitative research was conducted to foreigners who have got constraints in language adaptation during their living in Indonesia. The purpose of this research was to show how and when language barriers can hinder self-confidence building process which also affects personality development and individual improved performance. Purposive sampling was used to select 15 informants living in Surabaya. The research answers the following questions: How can language become a challenge to self-confidence building? What is the relationship between language and performance? The research results show that when there is a challenge during self-confidence building, personality development also suffers, which finally causes poor performance. Language barrier is one of the main challenges during self-confidence building process, where fear, anxiety, underestimation, negative thinking and feelings were mainly stated as obstacles during communication as a way of self-confidence building that later hinders personality development and performance among individuals. Everyone is a candidate to language change, environment change and culture change, that-s why the researcher recommends that in order to overcome language barriers and have effective self-confidence building process, people need to have positive thinking, self-concept, believe in their ability and be keen to learn.