This dream contains several interesting elements that can be interpreted in various ways.

1. Self-Driving Car: The self-driving car may symbolize a desire for control or a lack of control in your life. Since you didn’t have to touch the wheel or pedals, it might reflect feelings of being guided by circumstances or others rather than taking the wheel yourself.
2. Crashing in a Dumpster: This could represent feelings of failure or a fear of making mistakes. The dumpster suggests a place for discarded things, which might point to concerns about mistakes leading to feelings of waste or loss.
3. Flying with the Car: This transition from crashing to flying indicates a shift in perspective. Flying often symbolizes freedom and liberation, suggesting that despite setbacks, you may have the ability to rise above challenges and explore new possibilities.
4. Medieval Festival: The medieval setting may reflect a longing for simpler times or a fascination with history. It can also symbolize a journey into exploring your roots or traditions, perhaps indicating a desire to reconnect with past experiences or values.
5. Bending to Fit: The need to bend your knees to fit inside the rooms could symbolize adaptability. It may indicate that you are currently adjusting to different situations or environments, perhaps feeling restricted or out of place in some areas of your life.
6. Meeting Classmates: The presence of classmates and the distraction from your original goal might highlight social connections and the importance of relationships in your life. The desire to give them a drive without knowing how to drive reflects a willingness to take risks for the sake of others, even if it makes you feel uncertain.
7. Ending with Most Falling Asleep: This could suggest a sense of comfort in companionship, but it may also indicate a fear of missing out on opportunities or experiences while others remain passive.

In summary, this dream seems to reflect themes of control, exploration, adaptability, and the importance of social connections. It might be worth reflecting on your current life circumstances—are there areas where you feel out of control or are adapting to new situations? Are you balancing your desires with the needs and expectations of those around you? Consider these aspects as you navigate your waking life.