This mixed methods study explored the lived experiences of first-generation college seniors to develop a deeper understanding of the presence of impostor phenomenon during their college journey. Through a social constructivist lens, this study focused on the lived experiences of first-generation college seniors. This resulted in the understanding of how impostor phenomenon manifests among first-generation students and how perceived experiences of resilience and persistence aided the first- generation students on the journey to graduation. This study defined first-generation students as those whose parents did not attend college at all. The study sample consisted of 51 first-generation college seniors who completed the survey, six also participating in interviews. Data were analyzed through analysis of survey feedback consisting of three scales used to measure impostor phenomenon, resilience and persistence, as well as key themes that arose through descriptive statistics, interviews, and coding. Findings revealed first-generation college students experience impostor phenomenon and struggle with the question, "Do I belong here?" In addition, the findings showed a need to learn how to be confident, overcome self-doubt, navigate campus culture, and ask for help. Recommendations emerged for future first-year first- generation students, parents of first-generation students, professors, and financial aid counselors. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]