Dreams like yours can often reflect deeper feelings about guilt, fear, and the desire for escape. Here's a breakdown of some elements in your dream:

1. Setting in Mexico: This might indicate a desire for adventure or escape from your current life in Texas. It could also symbolize unfamiliarity and the feeling of being out of your comfort zone.
2. Running and Police: Running often signifies a flight response to stress or anxiety in waking life. The appearance of the police suggests feelings of being pursued by consequences or guilt, indicating that you may be avoiding dealing with certain issues.
3. Killing and Guilt: The act of killing someone in a dream, especially accidentally, can symbolize feelings of remorse or regret about something in your life. The transformation from an accident to intentional actions may suggest escalating feelings of guilt or fear of making irreversible mistakes.
4. The Ghost Employee: Ghosts in dreams can represent unresolved issues or feelings from the past. The refusal of service from the ghost may symbolize feelings of unworthiness or fear that you will not receive help or support when you need it.
5. The Nice Old Woman: This character may represent hope or kindness in your life. The act of buying a skateboard could symbolize a desire for freedom and fun, contrasting with the darker elements of the dream.
6. Repetition and Cycle: The realization that this will happen over and over suggests a feeling of being stuck in a cycle, perhaps indicating that you are grappling with a recurring issue or emotion that you feel powerless to change.

Overall, this dream might be urging you to confront feelings of guilt and anxiety. It may be beneficial to reflect on what aspects of your life feel unresolved or burdensome, and consider seeking support or finding ways to address these feelings constructively.