Dreams often reflect our inner thoughts, feelings, and experiences, and your dream seems to weave together themes of connection, protection, and loss. Here’s an interpretation of the key elements:

1. D&D Campaign with Friends: This suggests a desire for creativity, collaboration, and shared experiences. It may indicate that you value your friendships and the joy of teamwork.
2. Go-Kart Racing: This could symbolize a sense of adventure and excitement in your life. Sharing this experience with a new person may indicate a desire for new connections or romantic possibilities.
3. Flirting and Embracing: Expressing affection to this girl in your dream suggests a longing for intimacy and connection. It may represent feelings that you wish to explore in your waking life or an idealization of romance.
4. Dinner with Family and Strangers: This part may hint at social dynamics and the blending of your personal life with outside influences. The presence of "random white people" could symbolize feelings of diversity or the influence of unfamiliar people in your life.
5. Negative Comments About Her Hair: This moment represents vulnerability, highlighting how external judgments can affect self-esteem. Your instinct to protect her from negativity suggests that you have a strong sense of loyalty and empathy.
6. Getting Stabbed: This could symbolize the emotional pain you feel when trying to protect someone you care about. It may reflect fears of being hurt in relationships or the risks involved in caring deeply for others.
7. Climbing and Falling: Her climbing the rock pillar might represent ambition or striving for something beyond reach. The fall could symbolize loss, fear of failure, or the fragility of relationships. Given the cliff setting, it may also reflect a sense of instability in your emotional world.
8. Missing Her: Even though she wasn't real, missing her indicates that the emotions tied to this connection—whether romantic or platonic—are significant to you. It might reveal a yearning for deeper connections or the impact of loss in your life.

Overall, this dream seems to explore your feelings about relationships, vulnerability, and the impact of external negativity. It may be worthwhile to reflect on your current relationships and any fears or hopes you hold regarding intimacy and connection. Consider how you can foster positive dynamics in your waking life, both with yourself and others.