The goal of this pilot clinical trial is to assess the feasibility of conducting a full-scale study to learn if a new youth-adapted Narrative Enhancement and Cognitive Therapy (NECT-Y) reduces self-stigma in youth living with bipolar disorder or multiple mental health conditions. The main questions it aims to answer are: * What is the feasibility of conducting a definitive clinical trial in terms of recruitment success, study retention/compliance, treatment retention/compliance, and absence of serious adverse events? * Can facilitators deliver the adapted NECT-Y intervention with fidelity? * What is the acceptability of the newly adapted NECT-Y intervention among youth participants and facilitators? Researchers will compare NECT-Y to treatment as usual (TAU). Participants will take part in a virtual 14-week NECT-Y group intervention or receive TAU. They will also complete questionnaires at three time points (baseline, post-treatment, and follow-up).