This dream is rich with symbolism and emotions that reflect your relationships, desires, and perhaps some underlying frustrations or conflicts.

1. Travel and Family: The airplane represents a journey, possibly signifying transitions in your life. Being in business class suggests a sense of comfort or privilege, but the squished seating indicates feelings of being cramped or constrained, perhaps by family expectations or dynamics.
2. Food and Choices: The buffet may symbolize abundance and the choices available to you in life. Your feelings of missing out on something your sister enjoyed could reflect a fear of not seizing opportunities or feeling overlooked in your familial relationships.
3. Conflict with Parents: The confrontation with your parents about being in a show indicates a desire for transparency and acknowledgment. It’s possible that you feel your parents have not fully supported your aspirations or have kept certain truths from you, leading to feelings of anger and betrayal.
4. Identity and Self-Discovery: The revelation that you were in a show with your sister but can’t remember it may symbolize aspects of your identity or experiences that you feel are unacknowledged. This could relate to personal growth or talents that you believe have not been fully explored or supported.
5. Gaslighting and Validation: Your feelings of being gaslit by your parents suggest a need for validation. You may be seeking recognition for your feelings and experiences, and this dream points to the importance of open communication in your relationships.

Overall, this dream could be inviting you to explore your feelings about your family dynamics, personal choices, and the importance of asserting your identity. It may be beneficial to reflect on how you can communicate your needs and desires more effectively with your family and consider what steps you can take to pursue your own path.