Dreams set in a college environment often symbolize learning, growth, and the pursuit of knowledge. Your dream illustrates feelings of confusion and anxiety related to your responsibilities and expectations, particularly regarding your education or career.

1. Being Late and in the Wrong Class: This may reflect a fear of not meeting expectations or being unprepared in your waking life. It could indicate feelings of inadequacy or questioning whether you are on the right path.
2. Searching for the Chemistry Class: The specific focus on chemistry could symbolize a desire to understand complex relationships or situations in your life. The class number "111" may represent new beginnings or a fresh start, but searching for it suggests you might feel lost or uncertain about how to achieve that.
3. Using Apple Maps: This could symbolize your reliance on external guidance to navigate challenges. The fact that it led you to the wrong class might reflect feelings of being misled or struggling to find the right direction in your life.
4. Losing Your Belongings: This aspect of the dream indicates a sense of losing control or identity. The rain could symbolize emotional turmoil or stress, emphasizing feelings of vulnerability.
5. Not Finding the Classroom: Ending the dream without resolution can signify unresolved issues or concerns in your waking life. It may indicate that you are feeling overwhelmed and unable to find solutions to your problems.

In summary, this dream may be urging you to reflect on your current life situation. Consider areas where you feel lost, whether in your education, career, or personal life. It might be helpful to seek clarity and direction, perhaps by setting clear goals or discussing your feelings with someone you trust.