Your dream could be interpreted as a reflection of your current feelings about your past and your place in the world.
The falling-apart high school could represent the feeling that you are not living up to your potential or that you are not where you want to be in life. The crackheads and illegal raves could represent the negative aspects of your past or the things that you are trying to escape from.
The fact that you left the school and went home could represent your desire to move on from the past and to focus on the future. The ban from GAF could represent a fear of being excluded or rejected.
Ultimately, the meaning of your dream is up to you. But it could be a valuable tool for understanding your own thoughts and feelings.
Dreams often use symbolism to represent our subconscious thoughts and feelings. So, the meaning of your dream could be deeper than what you might initially think.
It's possible that the dream is representing your fear of being seen as a failure or of being judged by others. The crackheads could represent your own insecurities or self-doubt.
The illegal raves could represent your desire to rebel against authority or to escape from the pressures of society. The fact that you left the school and went home could represent your desire to find a place where you feel safe and accepted.
The ban from GAF could represent your fear of being excluded from a community or group that you care about. It could also represent your fear of being alone.
Again, the meaning of your dream is up to you. But it could be a valuable tool for understanding your own thoughts and feelings about your past, your present, and your future.