Castle: goal, because' castle' is very profound and gives people a mysterious feeling, so' castle' is extended here as: an unattainable goal. ...
Classmate: others, by extension: people around you.
Interpretation of dreams:
You are an ambitious person, but your character is too weak, which makes you hesitate and miss the opportunity. ...
Deep down in your heart, you really want to change. You don't want others to laugh at you and despise you all the time, so cheer yourself up again and hope that you will succeed at an early date. ...