Dreams can often reflect our emotions, experiences, and subconscious thoughts. In your dream, several themes emerge:

1. Identity and Transformation: Dreaming of being a different race or identity (like being a black king) may symbolize a desire for empowerment or a struggle with your own identity. It could indicate you’re exploring aspects of yourself or how you relate to others.
2. Conflict and Rejection: The interaction with your friend's mom and brothers suggests feelings of rejection or inadequacy. Their dismissal of you could represent fears of not being accepted or valued by your peers.
3. Destructive Behavior: Setting the place on fire may symbolize a desire to escape or retaliate against feelings of hurt or anger. This act can reflect a need to express pent-up emotions or a wish to break free from a situation that feels oppressive.
4. Consequences and Guilt: The aftermath of the fire and learning about the deaths can signify feelings of guilt or remorse. This part of the dream may point to anxieties about the consequences of your actions or a fear of causing harm, even unintentionally.
5. Seeking Support: Telling your teacher suggests a need for help or guidance. It could imply that you’re looking for a way to cope with your feelings and seek support in real life.

Overall, this dream might encourage you to reflect on your feelings of acceptance, the impact of your actions, and the importance of seeking help when dealing with difficult emotions. Consider journaling about your feelings or talking to someone you trust about any underlying issues that may be present.