Your dream is rich with symbolism and seems to reflect your ongoing journey of self-discovery, acceptance, and the complexities of your emotional landscape. Here are some interpretations of key elements in your dream:

1. Abandoned Building: The abandoned commercial building may symbolize feelings of neglect or confusion in your life. It represents a space where you are confronting your past, your identity, and the emotional turmoil you've experienced. The hallways and doors could signify the various paths you could take in your life, representing your search for self-acceptance and the many layers of your identity.
2. Missing Child: Searching for a missing child can symbolize your inner child or the parts of yourself that you feel are lost or neglected. This could reflect your longing to reclaim that innocence and joy that may have been overshadowed by your struggles with acceptance and the challenges you've faced.
3. Best Man Role and Mismatched Clothes: Being appointed as the best man at your friend's wedding signifies your desire for connection and support from those who care about you. However, the mismatched clothes represent feelings of inadequacy and the struggle with your identity. You may feel out of place or that you don't fit into traditional roles, reflecting your own journey of gender identity and self-acceptance.
4. Soiled Clothes and Searching for ID: The soiled ham could symbolize feelings of shame or embarrassment about your past or your current situation. The search for your ID represents your quest for identity and recognition, both from yourself and from others. Finding only old, expired documents may indicate feelings of being stuck in the past or not fully embracing your current identity.
5. Interaction with the Dog: The dog stealing the ham could represent your fears of losing control over your identity or being judged by others. Dogs often symbolize loyalty and companionship, so this interaction might also reflect a deeper fear of being misunderstood or abandoned.
6. Angry Mob: The mob chasing you signifies external pressures and societal judgments you may face regarding your gender identity. The fact that they could not harm you may indicate your resilience and strength in the face of adversity. It suggests that, despite the challenges, you have the ability to protect yourself emotionally and move forward.
7. Mother's Presence: Your mother’s appearance and your feelings of loss regarding her may highlight unresolved feelings about your family dynamics and acceptance. It could symbolize your yearning for maternal support and understanding, as well as the difficulties of reconciling your past with your present.
8. Final Decision to Return to the Party: Choosing to return to the wedding party instead of running from the mob signifies a turning point in your journey. It indicates a desire to embrace your identity and the community around you, despite fears and past traumas.

Overall, your dream appears to be a reflection of your internal struggles and desires. It illustrates the complex emotions of seeking acceptance and love while navigating the challenges of your gender identity and past experiences. To move forward, consider embracing your true self, seeking supportive communities, and continuing to explore your identity with compassion and understanding for yourself. Engaging in practices that nurture your inner child and foster self-love may also help you find peace and confidence in your journey.