Dream about not being able to find classroom is a metaphor for your ability to process emotions quickly. You have set overly high and unrealistic goals for yourself. You need to be more vocal about your feelings, particularly what makes your happy and what makes unhappy. This is unfortunately a warning signal for your desire to settle down. You tend to leave others no choices.
Not being able to find classroom dream is unfortunately some difficulty or some sort of hardship headed your way. You may not be in such solid ground as you thought. Sometimes, you need to indulge yourself and not worry about the consequences. Your dream stands for unresolved fears or doubts that needs to be confronted. You are in a lot of problems or that you are in deep trouble.
If you dreamt about not being able to find classroom:
And you, too, are not averse to openly expressing your sentiments. If you are in a permanent relationship, you will find your love for each other to be a very warming affair. If you are just embarking on a new relationship, you will certainly not be in the mood to hold back. Enjoy!