Dreams often serve as a reflection of our thoughts, feelings, and experiences. In your dream, several key elements stand out that may provide insight into your subconscious.

1. Surfing with a Friend: Surfing can symbolize navigating through emotions or challenges in life. Being with a friend might indicate a shared journey or support system you value.
2. Open Air Church and High School Friends: The church setting suggests a search for community, belonging, or spiritual connection. Seeing high school friends could represent nostalgia or unresolved issues from that period of your life. It may reflect your current feelings about past relationships and social dynamics.
3. Encountering an Old Friend: The old friend you had a falling out with may symbolize unresolved conflicts or feelings of regret. Her unfriendly demeanor could indicate feelings of unresolved tension or a reminder of how relationships can change over time.
4. Choosing Another Group: Opting for the friendly group shows your desire for acceptance and connection. This may reflect your current social needs and the importance of being around people who uplift you.
5. Deciding to Leave the Mass: Leaving the church service signifies a rejection of expectations or societal norms. It might indicate your desire for independence and the need to follow your own path rather than conforming to what others expect.
6. Returning to Your Art Gallery Home: The art gallery symbolizes creativity, self-expression, and personal space. It represents a safe haven where you can explore your identity and passions.
7. Walking and Exploring with an Acquaintance: This aspect of the dream highlights your desire for connection and exploration. The presence of the dog may symbolize loyalty and companionship, indicating a wish for supportive relationships.

Overall, this dream suggests a journey of self-discovery, a need for meaningful connections, and a desire to move away from past conflicts. It may be encouraging you to embrace new relationships while letting go of those that no longer serve you. Consider reflecting on your current friendships and how they align with your values and needs.