I was in a supermarket in a Dubai the night before I start my senior year
Dreams are often unique to the individual but here's a possible interpretation of your dream:
Being in a supermarket symbolizes the need or desire to gather resources to help you through your senior year. You could be feeling a little overwhelmed as senior year can be a challenge and you may feel that you need everything that is available to you. Being in Dubai could suggest that you are aspiring for bigger and better things and are at a point where you want to aim high. The fact that it was nighttime in the dream could signify that you feel a sense of uncertainty or apprehension regarding your upcoming senior year. In a way, it could be your subconscious mind encouraging you to face your fears and take control of your life as you move forward from that point.