At present, people, especially young adults, have constantly been using Instagram to socialize, connect, and share memories with other online peers. At the same time, it has been doubted, whether the use of Instagram on young adults could impact their self-esteem, as they are now using it as a part of their lifestyle. This paper research is aimed to study the purpose and behavior of using Instagram in young adults, and how they use of Instagram and feedback impact their self-esteem. To achieve the objectives, qualitative research was held to collect the data by conducting one-on-one interviews, with a total of 22 participants aged between 20 to 28 years old. As a result of completing the investigation, the researchers found that Instagram feedback, including followers, likes, and comments could influence young adults’ self-esteem, both directly and indirectly. The findings illustrated that such feedback could lead to social comparisons and social acceptance, further reflecting self-confidence and self-esteem.