Dreams about classrooms often symbolize learning, personal growth, or social dynamics. The presence of people you know and don’t know may suggest that you’re navigating different social situations or relationships in your waking life. Your crush walking by and your repeated greetings could indicate a desire for connection or acknowledgment from him.

Calling your crush by a friend's name might reflect some confusion or anxiety about your feelings, possibly indicating that you see aspects of your friend in your crush or that you feel pressured about how to express your feelings. Apologizing in the dream signifies self-awareness and a desire to correct any misunderstandings.

Overall, this dream could highlight your feelings towards your crush and the importance of social interactions in your life. It might be worth reflecting on how you feel about these relationships and what steps you may want to take in expressing your feelings or navigating social situations.