Why does blanche give an unreal impression to mitch in scene 5?

In Scene 5 of "A Streetcar Named Desire," Blanche gives an unreal impression to Mitch by carefully crafting her persona to present an idealized version of herself. She emphasizes her fragility and romantic ideals, using charm and vulnerability to mask her troubled past. Her deliberate avoidance of the truth and reliance on illusion create a façade that enchants Mitch but ultimately sets the stage for her eventual unraveling. This act of deception highlights Blanche's desperation for connection and fear of facing reality.