Your dream is rich with symbolism and reflects a complex blend of emotions and situations that you might be grappling with in your waking life. Here are some aspects to consider:

1. Running for Your Life: This could symbolize a feeling of being overwhelmed or threatened by something in your life. It may represent anxiety or stress that you are experiencing, possibly related to trust issues, as indicated by your mention of a cruel world where you can't trust anyone.
2. The Man with the Gun: This figure may represent a challenge, fear, or an aspect of yourself that feels threatening. The fact that he misses his shots might suggest that these fears or challenges are not as powerful as they seem, or that you're capable of dodging them.
3. Taking the Gun: Regaining control by taking the gun indicates a desire for empowerment or self-defense in your life. However, the subsequent miss could signify feelings of inadequacy or fear of failure when facing your challenges.
4. Working Together: The shift from confrontation to collaboration with the man suggests a need to find common ground or resolve inner conflicts. It may reflect a desire to integrate different aspects of yourself or to make peace with a difficult situation.
5. Fireworks and Celebration: The mention of buying fireworks could symbolize a desire for excitement or an escape from the seriousness of your current life. It may also represent a way to express yourself or bring joy into a stressful situation.
6. Henry and Christmas Lane: Meeting Henry and exploring Christmas decorations may symbolize hope, joy, or the pursuit of happiness. It could represent a longing for warmth and community amidst the chaos of your earlier experiences in the dream.
7. The Chapstick: This could signify self-care or comfort, highlighting your desire to maintain personal identity while navigating different social situations (with the man and Henry).

Overall, your dream might be urging you to confront your fears, seek collaboration in challenging situations, and strive for joy and comfort amidst the chaos of life. Consider reflecting on any current challenges you're facing and how you might approach them differently or seek support.