Dreams involving monsters often symbolize challenges or fears that we face in our waking life. In your dream, the big green monster from another dimension could represent an overwhelming issue or a fear that feels foreign and threatening. The fact that you're in an unknown town with unknown people suggests that you might be feeling out of place or uncertain in your current situation.

Your ability to fight the monster indicates that you have the potential to confront and overcome your fears, but your hesitation and fear to engage with it might reflect feelings of anxiety or doubt about your capabilities. Hiding away could suggest avoidance, indicating that you may be trying to escape from confronting certain issues in your life.

To gain deeper insight, consider what the monster might represent for you personally. Is there a situation or a feeling that you are trying to avoid? Reflecting on this could help you find the courage to confront your challenges. It may also be helpful to think about ways to gradually face your fears, rather than feeling overwhelmed by them.