He feels frightened because Scrooge doesn't know what will happen in his future and because this spirit is very silent.
He fears him the most
His potential future including his lonely death and what other genuinely feel about him
In Stave 3 of "A Christmas Carol," the Spirit of Christmas Present takes Scrooge on a journey around London to witness how people are celebrating Christmas. Scrooge starts to feel a sense of joy and compassion as he sees the happiness of others and begins to understand the true spirit of the holiday season.
Fort the ghost of Christmas past he disbelieved and resented the appetition despite feeling a hint of remorse for his actions. The ghost of Christmas present sees Scrooge starting to see what the true spirit of Christmas is. Scrooge starts to understand the impact he had on the lives of the Cratchit family and hears and sees what people think of him. Finally the ghost of Christmas yet to come, the most feared of all. Scrooge is scared not only of the ghost and its message but of the dark uncertainty that the spirit briings
He does. The Ghost of Christmas Present is showing him the visions of what Christmas now and across the 12 days of Christmas looks like. This is what Scrooge is missing in his life as the ghost states on their first meeting in the room. "Come in man and know me well" followed by "You do not recognise me do you or any of my brothers". Meaning that Scrooge did not see or live Christmas.
Scrooge's partner ,Jacob Marley, died on Christmas Eve. There is also the fact that Scrooge himself hates to see other people happy.
Disbelief of the first, surprise and confusion of the second and fear of the third
Scrooge says "Remove me" to the spirit at the end of Stave 2 because he becomes overwhelmed by the visions and memories that the spirit shows him. He cannot bear to see the pain and loneliness of his past, which make him feel vulnerable and exposed. Scrooge's reaction also shows his fear of confronting the truths about his own life and choices.
fear and shame
Scrooge feels fear and then discomfort as he sees his past. The Ghost of Christmas Past takes Scrooge to; His old School The streets of London at Christmas To Fezziwigs warehouse To Belles home
He hated it as he had been abandond at his Boarding School each Christmas when all others were at home with familiy
Ashamed of the way he has treated the loyal Bob