"I dreamed that I was locked in a house with many people, college classmates and junior high school teachers." I think you should meet your classmates and teachers first, which means that you yearn for it and you still miss the past. At this time, you found your present situation and were trapped in the house. There is a difference between expectation and reality, and you try to escape!
"When I saw someone talking on a mobile phone, I was depressed and wanted help." That means you are helpless. No one can help you!
The explanation of dreams is that memories are always full, but dreams can't be found in my heart and I don't know what to do! You are struggling inside, trying to find someone to make a decision for you, but you can't find it!